diff --git a/ui/@types/lichess/index.d.ts b/ui/@types/lichess/index.d.ts
index ab6ff1a6a3..1520451db0 100644
--- a/ui/@types/lichess/index.d.ts
+++ b/ui/@types/lichess/index.d.ts
@@ -300,7 +300,7 @@ declare type VariantKey =
   | 'racingKings'
   | 'crazyhouse';
 
-declare type Speed = 'bullet' | 'blitz' | 'classical' | 'correspondence';
+declare type Speed = 'ultraBullet' | 'bullet' | 'blitz' | 'rapid' | 'classical' | 'correspondence';
 
 declare type Perf =
   | 'bullet'
diff --git a/ui/analyse/src/explorer/explorerConfig.ts b/ui/analyse/src/explorer/explorerConfig.ts
index ffdb4e77c6..780b399b46 100644
--- a/ui/analyse/src/explorer/explorerConfig.ts
+++ b/ui/analyse/src/explorer/explorerConfig.ts
@@ -5,9 +5,12 @@ import { storedProp, storedJsonProp, StoredJsonProp, StoredProp } from 'common/s
 import { ExplorerDb, ExplorerSpeed, ExplorerMode } from './interfaces';
 import { snabModal } from 'common/modal';
 import AnalyseCtrl from '../ctrl';
+import { perf } from 'game/perf';
+import { iconTag } from '../util';
+import { ucfirst } from './explorerUtil';
 
 const allDbs: ExplorerDb[] = ['lichess', 'player'];
-const allSpeeds: ExplorerSpeed[] = ['bullet', 'blitz', 'rapid', 'classical'];
+const allSpeeds: ExplorerSpeed[] = ['ultraBullet', 'bullet', 'blitz', 'rapid', 'classical', 'correspondence'];
 const allModes: ExplorerMode[] = ['casual', 'rated'];
 const allRatings = [1600, 1800, 2000, 2200, 2500];
 
@@ -138,15 +141,15 @@ const masterDb = (ctrl: ExplorerConfigCtrl) =>
   ]);
 
 const radioButton =
-  <T>(ctrl: ExplorerConfigCtrl, storage: StoredJsonProp<T[]>) =>
+  <T>(ctrl: ExplorerConfigCtrl, storage: StoredJsonProp<T[]>, render?: (t: T) => VNode) =>
   (v: T) =>
     h(
       'button',
       {
-        attrs: { 'aria-pressed': `${storage().includes(v)}` },
+        attrs: { 'aria-pressed': `${storage().includes(v)}`, title: render ? ucfirst('' + v) : '' },
         hook: bind('click', _ => ctrl.toggleMany(storage)(v), ctrl.root.redraw),
       },
-      '' + v
+      render ? render(v) : '' + v
     );
 
 const lichessDb = (ctrl: ExplorerConfigCtrl) =>
@@ -161,7 +164,7 @@ const lichessDb = (ctrl: ExplorerConfigCtrl) =>
 const speedSection = (ctrl: ExplorerConfigCtrl) =>
   h('section.speed', [
     h('label', ctrl.root.trans.noarg('timeControl')),
-    h('div.choices', allSpeeds.map(radioButton(ctrl, ctrl.data.speed))),
+    h('div.choices', allSpeeds.map(radioButton(ctrl, ctrl.data.speed, s => iconTag(perf.icons[s])))),
   ]);
 
 const modeSection = (ctrl: ExplorerConfigCtrl) =>
diff --git a/ui/analyse/src/explorer/explorerUtil.ts b/ui/analyse/src/explorer/explorerUtil.ts
index c5d4a2ed48..ace1b0a1dd 100644
--- a/ui/analyse/src/explorer/explorerUtil.ts
+++ b/ui/analyse/src/explorer/explorerUtil.ts
@@ -11,3 +11,5 @@ export function winnerOf(fen: Fen, move: TablebaseMoveStats): Color | undefined
   if (move.variant_win || (move.dtz && move.dtz > 0)) return opposite(stm);
   return undefined;
 }
+
+export const ucfirst = (str: string) => `${str[0].toUpperCase()}${str.slice(1)}`;
diff --git a/ui/analyse/src/explorer/explorerView.ts b/ui/analyse/src/explorer/explorerView.ts
index 7fd4d59b07..18ad34ce1d 100644
--- a/ui/analyse/src/explorer/explorerView.ts
+++ b/ui/analyse/src/explorer/explorerView.ts
@@ -4,7 +4,7 @@ import { perf } from 'game/perf';
 import { bind, dataIcon, MaybeVNode } from 'common/snabbdom';
 import { defined } from 'common';
 import { view as renderConfig } from './explorerConfig';
-import { winnerOf } from './explorerUtil';
+import { ucfirst, winnerOf } from './explorerUtil';
 import AnalyseCtrl from '../ctrl';
 import {
   isOpening,
@@ -155,7 +155,7 @@ function showGameTable(ctrl: AnalyseCtrl, title: string, games: OpeningGame[]):
                   game.speed &&
                     h('i', {
                       attrs: {
-                        title: game.speed,
+                        title: ucfirst(game.speed),
                         ...dataIcon(perf.icons[game.speed]),
                       },
                     })
diff --git a/ui/analyse/src/explorer/explorerXhr.ts b/ui/analyse/src/explorer/explorerXhr.ts
index 4d27f070bf..0804796364 100644
--- a/ui/analyse/src/explorer/explorerXhr.ts
+++ b/ui/analyse/src/explorer/explorerXhr.ts
@@ -29,7 +29,10 @@ export async function opening(
   params.set('play', opts.play.join(','));
   if (opts.db === 'lichess') {
     params.set('variant', opts.variant || 'standard');
-    for (const speed of conf.speed()) params.append('speeds[]', speed);
+    conf
+      .speed()
+      .filter(s => s != 'ultraBullet' && s != 'correspondence')
+      .forEach(s => params.append('speeds[]', s));
     for (const rating of conf.rating()) params.append('ratings[]', rating.toString());
   }
   if (opts.db === 'player') {
diff --git a/ui/analyse/src/explorer/interfaces.ts b/ui/analyse/src/explorer/interfaces.ts
index 60debfd348..2fdf18f7b2 100644
--- a/ui/analyse/src/explorer/interfaces.ts
+++ b/ui/analyse/src/explorer/interfaces.ts
@@ -5,7 +5,7 @@ export interface Hovering {
 
 export type ExplorerDb = 'lichess' | 'masters' | 'player';
 
-export type ExplorerSpeed = 'bullet' | 'blitz' | 'rapid' | 'classical';
+export type ExplorerSpeed = Speed;
 export type ExplorerMode = 'casual' | 'rated';
 
 export interface PlayerOpts {