diff --git a/clients/vscode/package.json b/clients/vscode/package.json
index 2688c7a..11c59e6 100644
--- a/clients/vscode/package.json
+++ b/clients/vscode/package.json
@@ -53,12 +53,15 @@
         "tabby.serverUrl": {
           "type": "string",
           "default": "http://127.0.0.1:5000",
+          "pattern": "^https?:\\/\\/[^\\s]+$",
+          "patternErrorMessage": "Please enter a validate http or https URL.",
           "markdownDescription": "Specifies the url of [Tabby Server](https://github.com/TabbyML/tabby)."
         },
         "tabby.suggestionDelay": {
           "type": "number",
           "default": 150,
-          "markdownDescription": "Specifies the delay after which the request is sent to the tabby(ms)."
+          "minimum": 0,
+          "description": "Specifies the delay in milliseconds after which the request is sent to the tabby."
         }
       }
     }
@@ -99,6 +102,7 @@
     "webpack-cli": "^4.10.0"
   },
   "dependencies": {
+    "@sapphire/duration": "^1.1.0",
     "assert": "^2.0.0",
     "axios": "^1.3.4",
     "events": "^3.3.0",
diff --git a/clients/vscode/src/Commands.ts b/clients/vscode/src/Commands.ts
index 61050d3..c504d74 100644
--- a/clients/vscode/src/Commands.ts
+++ b/clients/vscode/src/Commands.ts
@@ -1,6 +1,16 @@
-import { ConfigurationTarget, workspace, window, commands } from "vscode";
+import {
+  ConfigurationTarget,
+  InputBoxValidationSeverity,
+  QuickPickItem,
+  QuickPickItemKind,
+  workspace,
+  window,
+  commands,
+} from "vscode";
+import { Duration } from "@sapphire/duration";
 import { ChoiceEvent, ApiError } from "./generated";
 import { TabbyClient } from "./TabbyClient";
+import { strict as assert } from "node:assert";
 
 const target = ConfigurationTarget.Global;
 
@@ -24,26 +34,60 @@ const setSuggestionDelay: Command = {
   command: "tabby.setSuggestionDelay",
   callback: () => {
     const configuration = workspace.getConfiguration("tabby");
-    window
-      .showInputBox({
-        prompt: "Enter the suggestion delay in ms",
-        value: configuration.get("suggestionDelay", "150"),
-      })
-      .then((delay) => {
-        if (delay) {
-          if (Number.parseInt(delay) !== null) {
-            console.debug("Set suggestion delay: ", Number.parseInt(delay));
-            configuration.update(
-              "suggestionDelay",
-              Number.parseInt(delay),
-              target,
-              false
-            );
-          } else {
-            console.debug("Set suggestion delay error. Wrong input.");
-          }
+    const current = configuration.get("suggestionDelay", 150);
+    const items = {
+      "Immediately": 0, // ms
+      "Default": 150,
+      "Slowly": 1000,
+    };
+    const createQuickPickItem = (value: number): QuickPickItem => {
+      const tags: string[] = [];
+      if (value == current) {
+        tags.push("Current");
+      }
+      Object.entries(items).forEach(([k, v]) => {
+        if (v == value) {
+          tags.push(k);
         }
       });
+      return {
+        label: value % 1000 == 0 ? `${value / 1000}s` : `${value}ms`,
+        description: tags.join(" "),
+        alwaysShow: true,
+      };
+    };
+    const buildQuickPickList = (input: string = "") => {
+      const list: QuickPickItem[] = [];
+      const customized = new Duration(input).offset || Number.parseInt(input);
+      if (customized >= 0) {
+        list.push(createQuickPickItem(customized));
+      }
+      if (current != customized) {
+        list.push(createQuickPickItem(current));
+      }
+      list.push({
+        label: "",
+        kind: QuickPickItemKind.Separator,
+      });
+      Object.values(items)
+        .filter((item) => item != current && item != customized)
+        .forEach((item) => list.push(createQuickPickItem(item)));
+      return list;
+    };
+    const quickPick = window.createQuickPick();
+    quickPick.placeholder = "Enter the delay after which the completion request is sent";
+    quickPick.matchOnDescription = true;
+    quickPick.items = buildQuickPickList();
+    quickPick.onDidChangeValue((input: string) => {
+      quickPick.items = buildQuickPickList(input);
+    });
+    quickPick.onDidAccept(() => {
+      quickPick.hide();
+      const delay = new Duration(quickPick.selectedItems[0].label).offset;
+      console.debug("Set suggestion delay: ", delay);
+      configuration.update("suggestionDelay", delay, target, false);
+    });
+    quickPick.show();
   },
 };
 
@@ -55,6 +99,18 @@ const setServerUrl: Command = {
       .showInputBox({
         prompt: "Enter the URL of your Tabby Server",
         value: configuration.get("serverUrl", ""),
+        validateInput: (input: string) => {
+          try {
+            let url = new URL(input);
+            assert(url.protocol == "http:" || url.protocol == "https:");
+          } catch (_) {
+            return {
+              message: "Please enter a validate http or https URL.",
+              severity: InputBoxValidationSeverity.Error,
+            };
+          }
+          return null;
+        },
       })
       .then((url) => {
         if (url) {
@@ -77,12 +133,15 @@ const emitEvent: Command = {
   command: "tabby.emitEvent",
   callback: (event: ChoiceEvent) => {
     console.debug("Emit Event: ", event);
-    tabbyClient.api.default.eventsV1EventsPost(event).then(() => {
-      tabbyClient.changeStatus("ready");
-    }).catch((err: ApiError) => {
-      console.error(err);
-      tabbyClient.changeStatus("disconnected");
-    });
+    tabbyClient.api.default
+      .eventsV1EventsPost(event)
+      .then(() => {
+        tabbyClient.changeStatus("ready");
+      })
+      .catch((err: ApiError) => {
+        console.error(err);
+        tabbyClient.changeStatus("disconnected");
+      });
   },
 };
 
diff --git a/clients/vscode/yarn.lock b/clients/vscode/yarn.lock
index 97b3964..f7c48fa 100644
--- a/clients/vscode/yarn.lock
+++ b/clients/vscode/yarn.lock
@@ -134,6 +134,11 @@
     "@nodelib/fs.scandir" "2.1.5"
     fastq "^1.6.0"
 
+"@sapphire/duration@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@sapphire/duration/-/duration-1.1.0.tgz#941d93585c6dd434d4d3416c28d2eb20d936db19"
+  integrity sha512-ATb2pWPLcSgG7bzvT6MglUcDexFSufr2FLXUmhipWGFtZbvDhkopGBIuHyzoGy7LZvL8UY5T6pRLNdFv5pl/Lg==
+
 "@tootallnate/once@1":
   version "1.1.2"
   resolved "https://registry.npmmirror.com/@tootallnate/once/-/once-1.1.2.tgz#ccb91445360179a04e7fe6aff78c00ffc1eeaf82"