[GH-ISSUE #440] perf: TTL-based eviction sweep for prefetch cache #96

New issue

Closed

opened 2026-05-06 12:37:11 +02:00 by BreizhHardware · 0 comments

BreizhHardware commented

2026-05-06 12:37:11 +02:00

Owner

Originally created by @Divkix on GitHub (Mar 11, 2026).
Original GitHub issue: https://github.com/cloudflare/vinext/issues/440

Problem

The prefetch cache in navigation.ts stores RSC prefetch responses with a 30s TTL and a hard cap of 50 entries. Expired entries are only cleaned on individual access or displaced by FIFO when at capacity. This means expired entries waste slots, causing premature eviction of still-valid entries on link-heavy pages.

Solution

Sweep all expired entries before resorting to FIFO eviction in storePrefetchResponse(). This ensures fresh entries survive longer under pressure without increasing the cache size cap.

Implementation

PR: #434

Originally created by @Divkix on GitHub (Mar 11, 2026). Original GitHub issue: https://github.com/cloudflare/vinext/issues/440 ## Problem The prefetch cache in `navigation.ts` stores RSC prefetch responses with a 30s TTL and a hard cap of 50 entries. Expired entries are only cleaned on individual access or displaced by FIFO when at capacity. This means expired entries waste slots, causing premature eviction of still-valid entries on link-heavy pages. ## Solution Sweep all expired entries before resorting to FIFO eviction in `storePrefetchResponse()`. This ensures fresh entries survive longer under pressure without increasing the cache size cap. ## Implementation PR: #434