diff --git a/packages/backend/src/core/FanoutTimelineEndpointService.ts b/packages/backend/src/core/FanoutTimelineEndpointService.ts
index 1ed4f1ee71..a15ee809bc 100644
--- a/packages/backend/src/core/FanoutTimelineEndpointService.ts
+++ b/packages/backend/src/core/FanoutTimelineEndpointService.ts
@@ -29,6 +29,7 @@ export class FanoutTimelineEndpointService {
 		untilId: string | null,
 		sinceId: string | null,
 		limit: number,
+		allowPartial: boolean,
 		me?: { id: MiUser['id'] } | undefined | null,
 		useDbFallback: boolean,
 		redisTimelines: (string | { name: string, fallbackIfEmpty: boolean })[],
@@ -43,6 +44,7 @@ export class FanoutTimelineEndpointService {
 		untilId: string | null,
 		sinceId: string | null,
 		limit: number,
+		allowPartial: boolean,
 		me?: { id: MiUser['id'] } | undefined | null,
 		useDbFallback: boolean,
 		redisTimelines: (string | { name: string, fallbackIfEmpty: boolean })[],
@@ -96,7 +98,7 @@ export class FanoutTimelineEndpointService {
 
 				console.log(`fanoutTimelineTrial#${trialCount++}: req: ${ps.limit}, tried: ${noteIds.length}, got: ${gotFromDb.length}, rate: ${lastSuccessfulRate}, total: ${redisTimeline.length}, fromRedis: ${redisResultIds.length}`);
 
-				if (redisTimeline.length >= ps.limit) {
+				if (ps.allowPartial ? redisTimeline.length !== 0 : redisTimeline.length >= ps.limit) {
 					// 十分Redisからとれた
 					return redisTimeline.slice(0, ps.limit);
 				}
diff --git a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
index 0d8a361c23..b5674be838 100644
--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -54,6 +54,7 @@ export const paramDef = {
 		untilId: { type: 'string', format: 'misskey:id' },
 		sinceDate: { type: 'integer' },
 		untilDate: { type: 'integer' },
+		allowPartial: { type: 'boolean', default: false }, // true is recommended but for compatibility false by default
 		includeMyRenotes: { type: 'boolean', default: true },
 		includeRenotedMyNotes: { type: 'boolean', default: true },
 		includeLocalRenotes: { type: 'boolean', default: true },
@@ -147,6 +148,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				untilId,
 				sinceId,
 				limit: ps.limit,
+				allowPartial: ps.allowPartial,
 				redisTimelines: timelineConfig,
 				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
 				noteFilter: (note) => {
diff --git a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
index a218c46bd3..97b05016ec 100644
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -51,6 +51,7 @@ export const paramDef = {
 		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
 		sinceId: { type: 'string', format: 'misskey:id' },
 		untilId: { type: 'string', format: 'misskey:id' },
+		allowPartial: { type: 'boolean', default: false }, // true is recommended but for compatibility false by default
 		sinceDate: { type: 'integer' },
 		untilDate: { type: 'integer' },
 	},
@@ -115,6 +116,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				untilId,
 				sinceId,
 				limit: ps.limit,
+				allowPartial: ps.allowPartial,
 				me,
 				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? ['localTimelineWithFiles'] : ['localTimeline', 'localTimelineWithReplies'],
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index 6120abac06..74d0a6e0c0 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -43,6 +43,7 @@ export const paramDef = {
 		untilId: { type: 'string', format: 'misskey:id' },
 		sinceDate: { type: 'integer' },
 		untilDate: { type: 'integer' },
+		allowPartial: { type: 'boolean', default: false }, // true is recommended but for compatibility false by default
 		includeMyRenotes: { type: 'boolean', default: true },
 		includeRenotedMyNotes: { type: 'boolean', default: true },
 		includeLocalRenotes: { type: 'boolean', default: true },
@@ -111,6 +112,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				untilId,
 				sinceId,
 				limit: ps.limit,
+				allowPartial: ps.allowPartial,
 				me,
 				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`homeTimelineWithFiles:${me.id}`] : [`homeTimeline:${me.id}`],
diff --git a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
index 3d5991d71c..f39cac5c3e 100644
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -53,6 +53,7 @@ export const paramDef = {
 		untilId: { type: 'string', format: 'misskey:id' },
 		sinceDate: { type: 'integer' },
 		untilDate: { type: 'integer' },
+		allowPartial: { type: 'boolean', default: false }, // true is recommended but for compatibility false by default
 		includeMyRenotes: { type: 'boolean', default: true },
 		includeRenotedMyNotes: { type: 'boolean', default: true },
 		includeLocalRenotes: { type: 'boolean', default: true },
@@ -133,6 +134,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				untilId,
 				sinceId,
 				limit: ps.limit,
+				allowPartial: ps.allowPartial,
 				me,
 				useDbFallback: serverSettings.enableFanoutTimelineDbFallback,
 				redisTimelines: ps.withFiles ? [`userListTimelineWithFiles:${list.id}`] : [`userListTimeline:${list.id}`],
diff --git a/packages/backend/src/server/api/endpoints/users/notes.ts b/packages/backend/src/server/api/endpoints/users/notes.ts
index 6958d28181..56983f7bc4 100644
--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@@ -51,6 +51,7 @@ export const paramDef = {
 		untilId: { type: 'string', format: 'misskey:id' },
 		sinceDate: { type: 'integer' },
 		untilDate: { type: 'integer' },
+		allowPartial: { type: 'boolean', default: false }, // true is recommended but for compatibility false by default
 		withFiles: { type: 'boolean', default: false },
 	},
 	required: ['userId'],
@@ -107,6 +108,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				untilId,
 				sinceId,
 				limit: ps.limit,
+				allowPartial: ps.allowPartial,
 				me,
 				redisTimelines,
 				useDbFallback: true,