diff --git a/area.js b/area.js
index 85fa316..4bdb9a5 100644
--- a/area.js
+++ b/area.js
@@ -1129,14 +1129,7 @@ var DrawingArea = new Lang.Class({
         }
         content += "\n</svg>";
         
-        let filename = `${Me.metadata['svg-file-name']} ${Files.getDateString()}.svg`;
-        let dir = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_PICTURES);
-        let path = GLib.build_filenamev([dir, filename]);
-        if (GLib.file_test(path, GLib.FileTest.EXISTS))
-            return false;
-        let success = GLib.file_set_contents(path, content);
-        
-        if (success) {
+        if (Files.saveSvg(content)) {
             // pass the parent (bgContainer) to Flashspot because coords of this are relative
             let flashspot = new Screenshot.Flashspot(this.get_parent());
             flashspot.fire();
@@ -1149,7 +1142,7 @@ var DrawingArea = new Lang.Class({
         }
     },
     
-    _saveAsJson: function(name, notify, callback) {
+    _saveAsJson: function(json, notify, callback) {
         // stop drawing or writing
         if (this.currentElement && this.currentElement.shape == Shapes.TEXT && this.isWriting) {
             this._stopWriting();
@@ -1157,46 +1150,31 @@ var DrawingArea = new Lang.Class({
             this._stopDrawing();
         }
         
-        let json = new Files.Json({ name });
-        let oldContents;
-        
-        if (name == Me.metadata['persistent-file-name']) {
-            let oldContents = json.contents;
-            // do not create a file to write just an empty array
-            if (!oldContents && this.elements.length == 0)
-                return;
-        }
-        
         // do not use "content = JSON.stringify(this.elements, null, 2);", neither "content = JSON.stringify(this.elements);"
         // do compromise between disk usage and human readability
-        let contents = `[\n  ` + new Array(...this.elements.map(element => JSON.stringify(element))).join(`,\n\n  `) + `\n]`;
-        
-        if (name == Me.metadata['persistent-file-name'] && contents == oldContents)
-            return;
+        let contents = this.elements.length ? `[\n  ` + new Array(...this.elements.map(element => JSON.stringify(element))).join(`,\n\n  `) + `\n]` : '[]';
         
         GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, () => {
             json.contents = contents;
             if (notify)
-                this.emit('show-osd', Files.Icons.SAVE, name, "", -1, false);
-            if (name != Me.metadata['persistent-file-name']) {
-                this.jsonName = name;
-                this.lastJsonContents = contents;
-            }
+                this.emit('show-osd', Files.Icons.SAVE, json.name, "", -1, false);
+            if (!json.isPersistent)
+                this.currentJson = json;
             if (callback)
                 callback();
         });
     },
     
     saveAsJsonWithName: function(name, callback) {
-        this._saveAsJson(name, false, callback);
+        this._saveAsJson(Files.Jsons.getNamed(name), false, callback);
     },
     
     saveAsJson: function() {
-        this._saveAsJson(Files.getDateString(), true);
+        this._saveAsJson(Files.Jsons.getDated(), true);
     },
     
     savePersistent: function() {
-        this._saveAsJson(Me.metadata['persistent-file-name']);
+        this._saveAsJson(Files.Jsons.getPersistent());
     },
     
     syncPersistent: function() {
@@ -1208,7 +1186,7 @@ var DrawingArea = new Lang.Class({
             
     },
     
-    _loadJson: function(name, notify) {
+    _loadJson: function(json, notify) {
         // stop drawing or writing
         if (this.currentElement && this.currentElement.shape == Shapes.TEXT && this.isWriting) {
             this._stopWriting();
@@ -1218,56 +1196,45 @@ var DrawingArea = new Lang.Class({
         this.elements = [];
         this.currentElement = null;
         
-        let contents = (new Files.Json({ name })).contents;
-        if (!contents)
+        if (!json.contents)
             return;
         
-        this.elements.push(...JSON.parse(contents).map(object => {
+        this.elements.push(...JSON.parse(json.contents).map(object => {
             if (object.image)
                 object.image = new Files.Image(object.image);
             return new Elements.DrawingElement(object);
         }));
         
         if (notify)
-            this.emit('show-osd', Files.Icons.OPEN, name, "", -1, false);
-        if (name != Me.metadata['persistent-file-name']) {
-            this.jsonName = name;
-            this.lastJsonContents = contents;
-        }
+            this.emit('show-osd', Files.Icons.OPEN, json.name, "", -1, false);
+        if (!json.isPersistent)
+            this.currentJson = json;
     },
     
     _loadPersistent: function() {
-        this._loadJson(Me.metadata['persistent-file-name']);
+        this._loadJson(Files.Jsons.getPersistent());
     },
     
-    loadJson: function(name, notify) {
-        this._loadJson(name, notify);
+    loadJson: function(json, notify) {
+        this._loadJson(json, notify);
         this._redisplay();
     },
     
     loadPreviousJson: function() {
-        let names = Files.getJsons().map(json => json.name);
-        
-        if (!names.length)
-            return;
-        
-        let previousName = names[this.jsonName && names.indexOf(this.jsonName) != names.length - 1 ? names.indexOf(this.jsonName) + 1 : 0];
-        this.loadJson(previousName, true);
+        let json = Files.Jsons.getPrevious(this.currentJson || null);
+        if (json)
+            this.loadJson(json, true);
     },
     
     loadNextJson: function() {
-        let names = Files.getJsons().map(json => json.name);
-        
-        if (!names.length)
-            return;
-        
-        let nextName = names[this.jsonName && names.indexOf(this.jsonName) > 0 ? names.indexOf(this.jsonName) - 1 : names.length - 1];
-        this.loadJson(nextName, true);
+        let json = Files.Jsons.getNext(this.currentJson || null);
+        if (json)
+            this.loadJson(json, true);
     },
     
     get drawingContentsHasChanged() {
         let contents = `[\n  ` + new Array(...this.elements.map(element => JSON.stringify(element))).join(`,\n\n  `) + `\n]`;
-        return contents != this.lastJsonContents;
+        return contents != (this.currentJson && this.currentJson.contents);
     }
 });
 
diff --git a/extension.js b/extension.js
index 95c1dd7..ca34b88 100644
--- a/extension.js
+++ b/extension.js
@@ -524,6 +524,8 @@ const AreaManager = new Lang.Class({
         Main.wm.removeKeybinding('toggle-modal');
         Main.wm.removeKeybinding('erase-drawings');
         this.removeAreas();
+        Files.Images.disable();
+        Files.Jsons.disable();
         if (this.indicator)
             this.indicator.disable();
     }
diff --git a/files.js b/files.js
index 15c2b91..a443c8b 100644
--- a/files.js
+++ b/files.js
@@ -1,5 +1,5 @@
 /* jslint esversion: 6 */
-/* exported Icons, Image, Images, Json, getJsons, getDateString */
+/* exported Icons, Image, Images, Json, Jsons, getDateString, saveSvg */
 
 /*
  * Copyright 2019 Abakkk
@@ -205,6 +205,12 @@ var Images = {
     _clipboardImages: [],
     _upToDate: false,
     
+    disable: function() {
+        this._images = [];
+        this._clipboardImages = [];
+        this._upToDate = false;
+    },
+    
     _clipboardImagesContains: function(file) {
         return this._clipboardImages.some(image => image.file.equal(file));
     },
@@ -265,7 +271,7 @@ var Images = {
                 let file = this.enumerator.get_child(info);
                 
                 if (info.get_content_type().indexOf('image') == 0 && !clipboardImagesContains(file)) {
-                    let image = oldImages.find(image => image.file.equal(file)) || new ImageWithGicon({ file, info });
+                    let image = oldImages.find(oldImage => oldImage.file.equal(file)) || new ImageWithGicon({ file, info });
                     newImages.push(image);
                     return { value: image, done: false };
                 } else {
@@ -287,7 +293,7 @@ var Images = {
     
     getPrevious: function(currentImage) {
         let images = this.getSorted();
-        let index = currentImage ? images.findIndex(image => image.file.equal(currentImage.file)) : 0;
+        let index = currentImage ? images.findIndex(image => image.file.equal(currentImage.file)) : -1;
         return images[index <= 0 ? images.length - 1 : index - 1] || null;
     },
     
@@ -333,6 +339,10 @@ var Json = new Lang.Class({
             this[key] = params[key];
     },
     
+    get isPersistent() {
+        return this.name == Me.metadata['persistent-file-name'];
+    },
+    
     toString: function() {
         return this.displayName || this.name;
     },
@@ -342,10 +352,10 @@ var Json = new Lang.Class({
     },
     
     get file() {
-        if (!this._file && this.name) 
+        if (!this._file) 
             this._file = Gio.File.new_for_path(GLib.build_filenamev([GLib.get_user_data_dir(), Me.metadata['data-dir'], `${this.name}.json`]));
         
-        return this._file || null;
+        return this._file;
     },
     
     set file(file) {
@@ -353,62 +363,167 @@ var Json = new Lang.Class({
     },
     
     get contents() {
-        let success_, contents;
-        try {
-            [success_, contents] = this.file.load_contents(null);
-            if (contents instanceof Uint8Array)
-                contents = ByteArray.toString(contents);
-        } catch(e) {
-            return null;
+        if (this._contents === undefined) {
+            try {
+                [, this._contents] = this.file.load_contents(null);
+                if (this._contents instanceof Uint8Array)
+                    this._contents = ByteArray.toString(this._contents);
+            } catch(e) {
+                this._contents = null;
+            }
         }
-        return contents;
+        
+        return this._contents;
     },
     
     set contents(contents) {
+        if (this.isPersistent && (this.contents == contents || !this.contents && contents == '[]'))
+            return;
+        
         try {
             this.file.replace_contents(contents, null, false, Gio.FileCreateFlags.NONE, null);
         } catch(e) {
             this.file.get_parent().make_directory_with_parents(null);
             this.file.replace_contents(contents, null, false, Gio.FileCreateFlags.NONE, null);
         }
+        
+        this._contents = contents;
     }
 });
 
-var getJsons = function() {
-    let directory = Gio.File.new_for_path(GLib.build_filenamev([GLib.get_user_data_dir(), Me.metadata['data-dir']]));
+var Jsons = {
+    _jsons: [],
+    _upToDate: false,
     
-    let enumerator;
-    try {
-        enumerator = directory.enumerate_children('standard::name,standard::display-name,standard::content-type,time::modified', Gio.FileQueryInfoFlags.NONE, null);
-    } catch(e) {
-        return [];
-    }
-    
-    let jsons = [];
-    let fileInfo = enumerator.next_file(null);
-    while (fileInfo) {
-        if (fileInfo.get_content_type().indexOf('json') != -1 && fileInfo.get_name() != `${Me.metadata['persistent-file-name']}.json`) {
-            let file = enumerator.get_child(fileInfo);
-            jsons.push(new Json({
-                file,
-                name: fileInfo.get_name().slice(0, -5),
-                displayName: fileInfo.get_display_name().slice(0, -5),
-                // fileInfo.get_modification_date_time: Gio 2.62+
-                modificationUnixTime: fileInfo.get_attribute_uint64('time::modified')
-            }));
+    disable: function() {
+        if (this._monitor) {
+            this._monitor.disconnect(this._monitorHandler);
+            this._monitor.cancel();
         }
-        fileInfo = enumerator.next_file(null);
+        
+        delete this._monitor;
+        delete this._persistent;
+        
+        this._jsons = [];
+        this._upToDate = false;
+    },
+    
+    _updateMonitor: function() {
+        if (this._monitor)
+            return;
+        
+        let directory = Gio.File.new_for_path(GLib.build_filenamev([GLib.get_user_data_dir(), Me.metadata['data-dir']]));
+        this._monitor = directory.monitor(Gio.FileMonitorFlags.NONE, null);
+        this._monitorHandler = this._monitor.connect('changed', (monitor, file) => {
+            if (file.get_basename() != `${Me.metadata['persistent-file-name']}.json` && file.get_basename().indexOf('.goutputstream'))
+                this.reset();
+        });
+    },
+    
+    [Symbol.iterator]: function() {
+        if (this._upToDate)
+            return this._jsons[Symbol.iterator]();
+        
+        this._updateMonitor();
+        this._upToDate = true;
+        let newJsons = this._jsons = [];
+        
+        return {
+            get enumerator() {
+                if (this._enumerator === undefined) {
+                    try {
+                        let directory = Gio.File.new_for_path(GLib.build_filenamev([GLib.get_user_data_dir(), Me.metadata['data-dir']]));
+                        this._enumerator = directory.enumerate_children('standard::name,standard::display-name,standard::content-type,time::modified', Gio.FileQueryInfoFlags.NONE, null);
+                    } catch(e) {
+                        this._enumerator = null;
+                    }
+                }
+                
+                return this._enumerator;
+            },
+            
+            next: function() {
+                if (!this.enumerator || this.enumerator.is_closed())
+                    return { done: true };
+                
+                let info = this.enumerator.next_file(null);
+                if (!info) {
+                    this.enumerator.close(null);
+                    return this.next();
+                }
+                
+                let file = this.enumerator.get_child(info);
+                
+                if (info.get_content_type().indexOf('json') != -1 && info.get_name() != `${Me.metadata['persistent-file-name']}.json`) {
+                    let json = new Json({
+                        file, name: info.get_name().slice(0, -5),
+                        displayName: info.get_display_name().slice(0, -5),
+                        // info.get_modification_date_time: Gio 2.62+
+                        modificationUnixTime: info.get_attribute_uint64('time::modified')
+                    });
+                    
+                    newJsons.push(json);
+                    return { value: json, done: false };
+                } else {
+                    return this.next();
+                }
+            }
+        };
+    },
+    
+    getSorted: function() {
+        return [...this].sort((a, b) => b.modificationUnixTime - a.modificationUnixTime);
+    },
+    
+    getNext: function(currentJson) {
+        let jsons = this.getSorted();
+        let index = currentJson ? jsons.findIndex(json => json.name == currentJson.name) : -1;
+        return jsons[index == jsons.length - 1 ? 0 : index + 1] || null;
+    },
+    
+    getPrevious: function(currentJson) {
+        let jsons = this.getSorted();
+        let index = currentJson ? jsons.findIndex(json => json.name == currentJson.name) : -1;
+        return jsons[index <= 0 ? jsons.length - 1 : index - 1] || null;
+    },
+    
+    getPersistent: function() {
+        if (!this._persistent)
+            this._persistent = new Json({ name: Me.metadata['persistent-file-name'] });
+        
+        return this._persistent;
+    },
+    
+    getDated: function() {
+        return new Json({ name: getDateString() });
+    },
+    
+    getNamed: function(name) {
+        return [...this].find(json => json.name == name) || new Json({ name });
+    },
+    
+    reset: function() {
+        this._upToDate = false;
     }
-    enumerator.close(null);
-    
-    jsons.sort((a, b) => {
-        return b.modificationUnixTime - a.modificationUnixTime;
-    });
-    
-    return jsons;
 };
 
 var getDateString = function() {
     let date = GLib.DateTime.new_now_local();
     return `${date.format("%F")} ${date.format("%X")}`;
 };
+
+var saveSvg = function(content) {
+    let filename = `${Me.metadata['svg-file-name']} ${getDateString()}.svg`;
+    let dir = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_PICTURES);
+    let path = GLib.build_filenamev([dir, filename]);
+    let file = Gio.File.new_for_path(path);
+    if (file.query_exists(null))
+        return false;
+    
+    try {
+        return file.replace_contents(content, null, false, Gio.FileCreateFlags.NONE, null);
+    } catch(e) {
+        return false;
+    }
+};
+
diff --git a/menu.js b/menu.js
index bc10dfa..c460073 100644
--- a/menu.js
+++ b/menu.js
@@ -562,10 +562,10 @@ var DrawingMenu = new Lang.Class({
     },
     
     _updateDrawingNameMenuItem: function() {
-        getActor(this.drawingNameMenuItem).visible = this.area.jsonName ? true : false;
-        if (this.area.jsonName) {
+        getActor(this.drawingNameMenuItem).visible = this.area.currentJson ? true : false;
+        if (this.area.currentJson) {
             let prefix = this.area.drawingContentsHasChanged ? "* " : "";
-            this.drawingNameMenuItem.label.set_text(`<i>${prefix}${this.area.jsonName}</i>`);
+            this.drawingNameMenuItem.label.set_text(`<i>${prefix}${this.area.currentJson.name}</i>`);
             this.drawingNameMenuItem.label.get_clutter_text().set_use_markup(true);
         }
     },
@@ -574,7 +574,7 @@ var DrawingMenu = new Lang.Class({
         let item = new PopupMenu.PopupSubMenuMenuItem(_("Open drawing"), true);
         this.openDrawingSubMenuItem = item;
         this.openDrawingSubMenu = item.menu;
-        item.setSensitive(Boolean(Files.getJsons().length));
+        item.setSensitive(Boolean(Files.Jsons.getSorted().length));
         item.icon.set_gicon(icon);
         
         item.menu.itemActivated = item.menu.close;
@@ -591,10 +591,10 @@ var DrawingMenu = new Lang.Class({
     
     _populateOpenDrawingSubMenu: function() {
         this.openDrawingSubMenu.removeAll();
-        let jsons = Files.getJsons();
+        let jsons = Files.Jsons.getSorted();
         jsons.forEach(json => {
             let subItem = this.openDrawingSubMenu.addAction(`<i>${String(json)}</i>`, () => {
-                this.area.loadJson(json.name);
+                this.area.loadJson(json);
                 this._updateDrawingNameMenuItem();
                 this._updateSaveDrawingSubMenuItemSensitivity();
             });