LiteSpeed Cache fully supports WordPress Multisite. One plugin installation caches every site in the network, and you decide which settings are enforced network-wide and which each site admin can change.
Before you start
- A WordPress Multisite network on LiteSpeed hosting, with Super Admin access.
- A backup of the network (see WordPress backups).
Install and network-activate
- Go to Network Admin → Plugins → Add New, search for LiteSpeed Cache and install it.
- Click Network Activate.
- A LiteSpeed Cache menu appears in Network Admin.
Note: Do not activate the plugin separately on individual sites; network activation is required for correct multisite behaviour.
Network settings
- Go to Network Admin → LiteSpeed Cache → General.
- Use Primary Site Configuration: On makes every site follow the main site's settings, which is simplest for most networks. Off lets each site admin manage their own settings.
- Configure caching in Network Admin → LiteSpeed Cache → Cache: enable cache, cache logged-in users, mobile cache if needed.
- Save and purge.
Site-level settings
If you allow per-site configuration, each site admin finds LiteSpeed Cache in their own dashboard for options such as page optimisation and exclusions. Keep risky optimisation, like delayed JavaScript, controlled centrally so one site admin cannot break shared themes (see page optimisation).
Purging
- Edits on a site purge that site's affected pages automatically.
- Purge All from a site's admin bar purges only that site.
- Network Admin → LiteSpeed Cache → Toolbox → Purge lets the Super Admin purge the whole network.
Domain-mapped sites
Sites with their own domains are cached separately per domain. Make sure each mapped domain has SSL (see AutoSSL) and is added in cPanel as an alias or addon so LiteSpeed serves it from the network's document root.
QUIC.cloud on multisite
Each site that uses QUIC.cloud services, such as image optimisation, needs its own domain key, because services are tied to domains (see QUIC.cloud basics).
Troubleshooting
One site shows another site's content
Usually a domain mapping or alias misconfiguration rather than caching. Check the domain points to the right site in Network Admin → Sites.
Settings changes do not apply on a site
Use Primary Site Configuration is on, so the site follows the main site. Change settings on the primary site instead.
General diagnosis is in LiteSpeed Cache troubleshooting.
Frequently asked questions
Does Multisite use more resources with caching?
Caching reduces load per site. A large network still adds up, so monitor Resource Usage and choose a plan that fits the total traffic.
Can I cache subdirectory and subdomain networks?
Yes. Both network types are supported by LiteSpeed Cache.
Will the crawler warm every site?
The crawler can work per site; on big networks, limit it to the most important sites to stay within resource limits.
Can site admins purge the whole network?
No. Site admins purge their own site; network-wide purges are for the Super Admin.