【教學文】如何加快 WordPress 速度

Browser Cache

General

Database Cache 和 Object Cache 並不需更改。 (因為並不需要用)
而 Browser Cache 是下載到你電腦的 Cache 會保留多久。

• Set Last-Modified header (tick)
• Set expires header (tick)
• Set cache control header (tick)
• Set entity tag (eTag) (tick)
• Set W3 Total Cache header (tick)
• Enable HTTP (gzip) compression (tick)
• Prevent caching of objects after settings change (untick)
• Don’t set cookies for static files (tick)
• Do not process 404 errors for static objects with WordPress (tick)
• 404 error exception list: (keep default)

CSS

• Set Last-Modified header (tick)
• Set expires header (tick)
• Expires header lifetime: 31536000 seconds
• Set cache control header (tick)
• Cache Control policy: cache (“public”)
• Set entity tag (ETag) (tick)
• Set W3 Total Cache header (tick)
• Enable HTTP (gzip) compression (tick)
• Prevent caching of objects after settings change (untick)
• Disable cookies for static files (tick)

HTML & XML

• Set Last-Modified header (tick)
• Set expires header (tick)
• Expires header lifetime: 7200 seconds
• Set cache control header (tick)
• Cache Control policy: cache with max-age (“public, max-age=EXPIRES_SECONDS”)
• Set entity tag (ETag) (tick)
• Set W3 Total Cache header (tick)
• Enable HTTP (gzip) compression (tick)

Media & Other Files

• Set Last-Modified header (tick)
• Set expires header (tick)
• Expires header lifetime: 31536000 seconds
• Set cache control header (tick)
• Cache Control policy: cache (“public”)
• Set entity tag (ETag) (tick)
• Set W3 Total Cache header (tick)
• Enable HTTP (gzip) compression (tick)
• Prevent caching of objects after settings change (untick)
• Disable cookies for static files (tick)

Browser Cache 的保留時間越長，對 server 的負荷會較低，而網頁的速度亦會因為不用下載而再加快。
不過網頁 update 後用戶未必能即時更新，而 “Prevent caching of objects after settings change” 可以防止這情況，但是 search engine 對不同版本的網頁可能當作新一頁，不利 SEO (即時在搜尋引擎排名會較低)。
所以不建議開啓這個選項。