diff --git a/src/components/proxies/Proxy.tsx b/src/components/proxies/Proxy.tsx
index 47a3d54..4b63921 100644
--- a/src/components/proxies/Proxy.tsx
+++ b/src/components/proxies/Proxy.tsx
@@ -2,7 +2,7 @@ import { TooltipPopup, useTooltip } from '@reach/tooltip';
 import cx from 'clsx';
 import * as React from 'react';
 
-import { State } from '$src/store/types';
+import { ProxyDelayItem, State } from '$src/store/types';
 
 import { getDelay, getProxies, NonProxyTypes } from '../../store/proxies';
 import { connect } from '../StateProvider';
@@ -22,7 +22,9 @@ const colorMap = {
   na: '#909399',
 };
 
-function getLabelColor({ number }: { number?: number } = {}) {
+function getLabelColor(latency: ProxyDelayItem) {
+  if (!latency || latency.kind !== 'Result') return colorMap.na;
+  const number = latency.number;
   if (number === 0) {
     return colorMap.na;
   } else if (number < 200) {
@@ -35,7 +37,7 @@ function getLabelColor({ number }: { number?: number } = {}) {
   return colorMap.na;
 }
 
-function getProxyDotStyle(latency: { number?: number }, proxyType: string) {
+function getProxyDotStyle(latency: ProxyDelayItem, proxyType: string) {
   if (NonProxyTypes.indexOf(proxyType) > -1) {
     return { border: '1px dotted #777' };
   }
@@ -47,7 +49,7 @@ type ProxyProps = {
   name: string;
   now?: boolean;
   proxy: any;
-  latency?: { number?: number };
+  latency?: ProxyDelayItem;
   isSelectable?: boolean;
   onClick?: (proxyName: string) => unknown;
 };
@@ -56,7 +58,7 @@ function ProxySmallImpl({ now, name, proxy, latency, isSelectable, onClick }: Pr
   const style = useMemo(() => getProxyDotStyle(latency, proxy.type), [latency, proxy]);
   const title = useMemo(() => {
     let ret = name;
-    if (latency && typeof latency.number === 'number') {
+    if (latency && latency.kind === 'Result' && typeof latency.number === 'number') {
       ret += ' ' + latency.number + ' ms';
     }
     return ret;
@@ -152,7 +154,7 @@ function ProxyImpl({ now, name, proxy, latency, isSelectable, onClick }: ProxyPr
         <span className={s0.proxyType} style={{ opacity: now ? 0.6 : 0.2 }}>
           {formatProxyType(proxy.type)}
         </span>
-        <ProxyLatency number={latency?.number} color={color} />
+        <ProxyLatency latency={latency} color={color} />
       </div>
     </div>
   );
diff --git a/src/components/proxies/ProxyLatency.tsx b/src/components/proxies/ProxyLatency.tsx
index 29036d5..7ba2604 100644
--- a/src/components/proxies/ProxyLatency.tsx
+++ b/src/components/proxies/ProxyLatency.tsx
@@ -1,16 +1,32 @@
 import * as React from 'react';
 
+import { ProxyDelayItem } from '$src/store/types';
+
 import s0 from './ProxyLatency.module.scss';
 
 type ProxyLatencyProps = {
-  number?: number;
+  latency: ProxyDelayItem | undefined;
   color: string;
 };
 
-export function ProxyLatency({ number, color }: ProxyLatencyProps) {
+export function ProxyLatency({ latency, color }: ProxyLatencyProps) {
+  let text = ' ';
+  if (latency) {
+    switch (latency.kind) {
+      case 'Error':
+      case 'Testing':
+        text = '- ms';
+        break;
+      case 'Result':
+        text = (latency.number !== 0 ? latency.number : '-') + ' ms';
+        break;
+      default:
+        break;
+    }
+  }
   return (
     <span className={s0.proxyLatency} style={{ color }}>
-      {typeof number === 'number' && number !== 0 ? number + ' ms' : ' '}
+      {text}
     </span>
   );
 }
diff --git a/src/misc/i18n.ts b/src/misc/i18n.ts
index 13cedd4..e8515c4 100644
--- a/src/misc/i18n.ts
+++ b/src/misc/i18n.ts
@@ -5,11 +5,7 @@ import { initReactI18next } from 'react-i18next';
 
 const LngBackend = {
   type: 'backend' as const,
-  read: (
-    lng: string,
-    _namespace: string,
-    callback: ReadCallback,
-  ) => {
+  read: (lng: string, _namespace: string, callback: ReadCallback) => {
     let p: PromiseLike<{ data: any }>;
     switch (lng) {
       case 'zh':
@@ -22,12 +18,15 @@ const LngBackend = {
         break;
     }
     if (p) {
-      p.then(d => callback(null, d.data), err => callback(err, null));
+      p.then(
+        (d) => callback(null, d.data),
+        (err) => callback(err, null)
+      );
     } else {
-      callback(new Error(`unable to load translation file for language ${lng}`), null)
+      callback(new Error(`unable to load translation file for language ${lng}`), null);
     }
-  }
-}
+  },
+};
 
 i18next
   .use(initReactI18next)
diff --git a/src/store/proxies.tsx b/src/store/proxies.tsx
index 5f4c0aa..0022816 100644
--- a/src/store/proxies.tsx
+++ b/src/store/proxies.tsx
@@ -59,7 +59,7 @@ function mapLatency(names: string[], getProxy: (name: string) => { history: Late
     const history = p.history;
     const h = history[history.length - 1];
     if (h && typeof h.delay === 'number') {
-      result[name] = { number: h.delay };
+      result[name] = { kind: 'Result', number: h.delay };
     }
   }
   return result;
@@ -268,18 +268,35 @@ export function switchProxy(apiConfig: ClashAPIConfig, groupName: string, itemNa
 
 function requestDelayForProxyOnce(apiConfig: ClashAPIConfig, name: string) {
   return async (dispatch: DispatchFn, getState: GetStateFn) => {
-    const latencyTestUrl = getLatencyTestUrl(getState());
-    const res = await proxiesAPI.requestDelayForProxy(apiConfig, name, latencyTestUrl);
-    let error = '';
-    if (res.ok === false) {
-      error = res.statusText;
-    }
-    const { delay } = await res.json();
-    const delayNext = { ...getDelay(getState()), [name]: { error, number: delay } };
-
-    dispatch('requestDelayForProxyOnce', (s) => {
-      s.proxies.delay = delayNext;
+    dispatch('set latency state to testing in progress', (s) => {
+      s.proxies.delay = { ...getDelay(getState()), [name]: { kind: 'Testing' } };
     });
+
+    const latencyTestUrl = getLatencyTestUrl(getState());
+
+    try {
+      const res = await proxiesAPI.requestDelayForProxy(apiConfig, name, latencyTestUrl);
+      if (res.ok) {
+        const { delay } = await res.json();
+        dispatch('set latency result', (s) => {
+          s.proxies.delay = { ...getDelay(getState()), [name]: { kind: 'Result', number: delay } };
+        });
+      } else {
+        dispatch('set latency testing error', (s) => {
+          s.proxies.delay = {
+            ...getDelay(getState()),
+            [name]: { kind: 'Error', message: res.statusText },
+          };
+        });
+      }
+    } catch (err) {
+      dispatch('set latency testing networkish error', (s) => {
+        s.proxies.delay = {
+          ...getDelay(getState()),
+          [name]: { kind: 'Error', message: err.message || err.type },
+        };
+      });
+    }
   };
 }
 
@@ -292,30 +309,31 @@ export function requestDelayForProxy(apiConfig: ClashAPIConfig, name: string) {
 export function requestDelayForProxies(apiConfig: ClashAPIConfig, names: string[]) {
   return async (dispatch: DispatchFn, getState: GetStateFn) => {
     const proxies = getProxies(getState());
-    const latencyTestUrl = getLatencyTestUrl(getState());
 
     const proxyDedupMap = new Map<string, boolean>();
     const providerDedupMap = new Map<string, boolean>();
 
-    const works = names.map((name) => {
+    const works: Array<Promise<void>> = [];
+
+    names.forEach((name) => {
       const p = proxies[name];
       if (!p.__provider) {
-        if (proxyDedupMap.get(name)) {
-          return undefined;
-        } else {
+        if (!proxyDedupMap.get(name)) {
           proxyDedupMap.set(name, true);
-          return proxiesAPI.requestDelayForProxy(apiConfig, name, latencyTestUrl);
+          dispatch(requestDelayForProxyOnce(apiConfig, name));
         }
       } else if (p.__provider) {
-        // this one is from a proxy provider
-        if (providerDedupMap.get(p.__provider)) {
-          return undefined;
-        } else {
-          providerDedupMap.set(p.__provider, true);
-          return healthcheckProviderByNameInternal(apiConfig, p.__provider);
+        if (!proxyDedupMap.get(name)) {
+          proxyDedupMap.set(name, true);
+          dispatch('set latency state to testing in progress', (s) => {
+            s.proxies.delay = { ...getDelay(getState()), [name]: { kind: 'Testing' } };
+          });
+        }
+        // this one is from a proxy provider
+        if (!providerDedupMap.get(p.__provider)) {
+          providerDedupMap.set(p.__provider, true);
+          works.push(healthcheckProviderByNameInternal(apiConfig, p.__provider));
         }
-      } else {
-        return undefined;
       }
     });
     await Promise.all(works);
diff --git a/src/store/types.ts b/src/store/types.ts
index b0b457e..867e437 100644
--- a/src/store/types.ts
+++ b/src/store/types.ts
@@ -40,9 +40,11 @@ export type ProxyItem = {
   __provider?: string;
 };
 
-export type ProxyDelayItem = {
-  number?: number;
-};
+export type ProxyDelayItem =
+  | { kind: 'Result'; number: number }
+  | { kind: 'Testing' }
+  | { kind: 'Error'; message: string }
+  | { kind: 'None' };
 
 export type ProxiesMapping = Record<string, ProxyItem>;
 export type DelayMapping = Record<string, ProxyDelayItem>;