diff --git a/nix-monitor/README.md b/nix-monitor/README.md
index 1112ea9..e78d5ba 100644
--- a/nix-monitor/README.md
+++ b/nix-monitor/README.md
@@ -13,7 +13,7 @@ NixOS generations, store size, closure size, and update status from the bar.
 ## Requirements
 
 This plugin is intended for NixOS. It uses `nix`, `nixos-version`,
-`nixos-rebuild`, and `git`, plus the standard commands `du`, `cat`, `awk`,
+`nixos-rebuild`, `nix-store`, and `git`, plus the standard commands `du`, `cat`, `read`, `echo`, `awk`,
 `grep`, `tail`, `wc`, `kill`, and `pkill`. Home Manager generation information
 is shown when `home-manager` is available.
 
@@ -29,8 +29,8 @@ Open the panel directly with:
 noctalia msg panel-toggle avivbintangaringga/nix-monitor:panel
 ```
 
-Set `update_command` before using **Update**. **Clean** runs the configured
-cleanup command, which defaults to `nix-collect-garbage -d`. Both commands open
+Set `update_command` before using **Update**. **Optimize** runs the configured command `nix-store --optimise -vv`. **Clean** runs the configured
+cleanup command, which defaults to `nix-collect-garbage -d`. All commands open
 in a terminal so you can review their output.
 
 ## Settings
@@ -47,7 +47,8 @@ Update behavior:
 | `show_update_available_notification` | `true` | Notifies when a newer revision is available. |
 | `branch` | `nixos-unstable` | Nixpkgs branch compared by the service. |
 | `update_command` | *(empty)* | Command launched by the panel's **Update** button. |
-| `clean_command` | `nix-collect-garbage -d` | Command launched by **Clean**. |
+| `optimize_command` | `nix-store --optimize -vv` | Command launched by the panel's **Optimize** button. |
+| `clean_command` | `nix-collect-garbage -d` | Command launched by the panel's **Clean** button. |
 | `close_on_enter` | `true` | Keeps the command terminal open until Enter is pressed. |
 
 Widget appearance:
diff --git a/nix-monitor/nix_monitor_service.luau b/nix-monitor/nix_monitor_service.luau
index a808fb2..8252cc8 100644
--- a/nix-monitor/nix_monitor_service.luau
+++ b/nix-monitor/nix_monitor_service.luau
@@ -23,7 +23,8 @@ end
 
 function killWithPidFile(file)
 	if noctalia.fileExists(file) then
-		local pid = noctalia.string.trim(noctalia.readFile(file))
+		local content = noctalia.readFile(file) or ""
+		local pid = noctalia.string.trim(content)
 
 		if type(pid) == "string" and pid ~= "" then
 			noctalia.runAsync(`pkill -9 -P {pid} && kill -9 {pid}`)
@@ -38,7 +39,7 @@ local updateCheckInterval = cfg("update_check_interval")
 local updateCheckDurationThreshold = cfg("update_check_duration_threshold")
 local systemStatsCheckInterval = cfg("system_stats_check_interval")
 local systemStatsCheckDurationThreshold = cfg("system_stats_check_duration_threshold")
-local stateDir = "/tmp/nix-monitor"
+local stateDir = noctalia.pluginDataDir() or "/tmp/nix-monitor"
 local remoteHashFile = stateDir .. "/remoteHash"
 local storeSizeFile = stateDir .. "/storeSize"
 local closureSizeFile = stateDir .. "/closureSize"
@@ -95,7 +96,7 @@ end
 -- Currently it is writing to a file because when I use the runAsync with
 -- the callback, it is timed out
 function checkRemoteHash(delay: number?)
-	local delay = delay or 0
+	local _delay = delay or 0
 
 	if getState("isRemoteCheckRunning") then
 		return
@@ -109,12 +110,13 @@ function checkRemoteHash(delay: number?)
 	end
 
 	noctalia.writeFile(remoteHashFile, "")
-	noctalia.runAsync(`sleep {delay} && {remoteHashCmd} > {remoteHashFile} & echo $! > {remotePidFile}`)
+	noctalia.runAsync(`sleep {_delay} && {remoteHashCmd} > {remoteHashFile} & echo $! > {remotePidFile}`)
 end
 
 -- Check if the remoteHash check command is finished by reading the file
 function checkRemoteStatus()
-	local remoteHash = noctalia.string.trim(noctalia.readFile(remoteHashFile))
+	local remoteHashFileContent = noctalia.readFile(remoteHashFile) or ""
+	local remoteHash = noctalia.string.trim(remoteHashFileContent)
 
 	if type(remoteHash) == "string" and remoteHash ~= "" then
 		setState("isRemoteCheckRunning", false)
@@ -179,8 +181,10 @@ function checkSystemStats()
 end
 
 function checkSystemStatsFile()
-	local storeSize = noctalia.string.trim(noctalia.readFile(storeSizeFile))
-	local closureSize = noctalia.string.trim(noctalia.readFile(closureSizeFile))
+	local storeSizeFileContent = noctalia.readFile(storeSizeFile) or ""
+	local storeSize = noctalia.string.trim(storeSizeFileContent)
+	local closureSizeFileContent = noctalia.readFile(closureSizeFile) or ""
+	local closureSize = noctalia.string.trim(closureSizeFileContent)
 
 	if typeof(storeSize) == "string" and storeSize ~= "" then
 		setState("storeSize", storeSize)
diff --git a/nix-monitor/panel.luau b/nix-monitor/panel.luau
index dde6834..2868b48 100644
--- a/nix-monitor/panel.luau
+++ b/nix-monitor/panel.luau
@@ -119,6 +119,19 @@ local function render()
 		end
 	end
 
+	if not cfg("hide_optimize_button") then
+		table.insert(
+			buttons,
+			ui.button({
+				text = tr("panel.optimize"),
+				glyph = "database-cog",
+				flexGrow = 1,
+				variant = "primary",
+				onClick = "onOptimizeClicked",
+			})
+		)
+	end
+
 	if not cfg("hide_clean_button") then
 		table.insert(
 			buttons,
@@ -273,3 +286,18 @@ function onCleanClicked()
 	panel.close()
 	noctalia.runInTerminal(command)
 end
+
+function onOptimizeClicked()
+	local command = cfg("optimize_command")
+	if command == "" then
+		noctalia.notifyError(tr("notification.optimize_command_is_empty"))
+		return
+	end
+
+	if cfg("close_on_enter") then
+		command = `{command} && echo && read -p "{tr("terminal.press_enter_to_exit")}"`
+	end
+
+	panel.close()
+	noctalia.runInTerminal(command)
+end
diff --git a/nix-monitor/plugin.toml b/nix-monitor/plugin.toml
index 01b885b..d65b9d8 100644
--- a/nix-monitor/plugin.toml
+++ b/nix-monitor/plugin.toml
@@ -1,12 +1,12 @@
 id              = "avivbintangaringga/nix-monitor"
 name            = "Nix Monitor"
-version         = "1.1.1"
-plugin_api    = 3
+version         = "1.2.0"
+plugin_api      = 3
 icon            = "package"
 author          = "avivbintangaringga"
 description     = "Nixpkgs update monitor"
 tags            = [ "nixos", "utility" ]
-dependencies    = [ "nix", "nixos-version", "nixos-rebuild", "git", "du", "cat", "awk", "grep", "tail", "wc", "kill", "pkill" ]
+dependencies    = [ "nix", "nixos-version", "nixos-rebuild", "nix-store", "git", "du", "cat", "echo", "read", "awk", "grep", "tail", "wc", "kill", "pkill" ]
 license         = "MIT"
 
 [[widget]]
@@ -180,6 +180,13 @@ label_key       = "setting.update_command.label"
 description_key = "setting.update_command.description"
 default         = ""
 
+[[setting]]
+key             = "optimize_command"
+type            = "string"
+label_key       = "setting.optimize_command.label"
+description_key = "setting.optimize_command.description"
+default         = "nix-store --optimise -vv"
+
 [[setting]]
 key             = "clean_command"
 type            = "string"
@@ -194,6 +201,13 @@ label_key       = "setting.hide_update_button.label"
 description_key = "setting.hide_update_button.description"
 default         = false
 
+[[setting]]
+key             = "hide_optimize_button"
+type            = "bool"
+label_key       = "setting.hide_optimize_button.label"
+description_key = "setting.hide_optimize_button.description"
+default         = false
+
 [[setting]]
 key             = "hide_clean_button"
 type            = "bool"
diff --git a/nix-monitor/thumbnail.webp b/nix-monitor/thumbnail.webp
index 12b26c2..a3f894a 100644
Binary files a/nix-monitor/thumbnail.webp and b/nix-monitor/thumbnail.webp differ
diff --git a/nix-monitor/translations/en.json b/nix-monitor/translations/en.json
index 87cbe87..74140ec 100644
--- a/nix-monitor/translations/en.json
+++ b/nix-monitor/translations/en.json
@@ -8,6 +8,7 @@
   "notification": {
     "checking_update": "Checking NixOS update...",
     "clean_command_is_empty": "Clean command is empty!",
+    "optimize_command_is_empty": "Optimize command is empty!",
     "update_check_completed": "NixOS update check completed!",
     "update_command_is_empty": "Update command is empty!",
     "update_is_available": "NixOS update is available!"
@@ -15,6 +16,7 @@
   "panel": {
     "cancel": "Cancel",
     "check": "Check",
+    "optimize": "Optimize",
     "clean": "Clean",
     "closure_size": "Closure size",
     "current": "Current",
@@ -30,6 +32,14 @@
       "description": "Which nixpkgs branch to use",
       "label": "Branch"
     },
+    "update_command": {
+      "description": "Command to run when clicking Update button",
+      "label": "Update command"
+    },
+    "optimize_command": {
+      "label": "Optimize command",
+      "description": "Command to run when clicking Optimize button"
+    },
     "clean_command": {
       "description": "Command to run when clicking Clean button",
       "label": "Clean command"
@@ -38,14 +48,18 @@
       "description": "Add 'Press enter to exit' on the terminal window",
       "label": "Close on press Enter"
     },
-    "hide_clean_button": {
-      "description": "Whether to hide the clean button on the panel",
-      "label": "Hide clean button"
-    },
     "hide_update_button": {
       "description": "Whether to hide the update button on the panel",
       "label": "Hide update button"
     },
+    "hide_optimize_button": {
+      "label": "Hide optimize button",
+      "description": "Whether to hide the optimize button on the panel"
+    },
+    "hide_clean_button": {
+      "description": "Whether to hide the clean button on the panel",
+      "label": "Hide clean button"
+    },
     "option": {
       "branch": {
         "master": "Master",
@@ -91,10 +105,6 @@
       "description": "How often to check for updates (in minutes)",
       "label": "Update check interval"
     },
-    "update_command": {
-      "description": "Command to run when clicking Update button",
-      "label": "Update command"
-    },
     "widget": {
       "checking_color": {
         "label": "Checking color"