I upgraded (automatically) wordpress MU to the newest version of wordpress : 3.4.2, it went well but since then, the backoffice is too slow (/wp-admin).
So I manually downloaded the latest wordpress and replaced /wp-admin and /wp-includes by the newest versions of these directories...but still the same (like 1 minute for rendering a page).
Do you have any idea ?
Thank you a lot !
ps : i'm self hosted, so i have complete access to the server.
ps2 : on this same server, i have another wordpress running the 3.4.2 without a glitch ! (not a multisite install yet)
ps3 : I reinstalled automatically, but nothing faster