I'm just wondering are you using any sort of system to keep that php-cache folder at a reasonable level? Never thought much about it but some machines after running it for a long time are seeing close to 7 gigs being used by the folder.
As for the performance increase I just upped the shm size to 128mb and modified the the sys so it could have a shm that big. Seemd to improve things much more since it's actually putting a lot more into shm compared to before.
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