[TECK]

While looking at the code fast ... Basically, the plugin accelerator writes all exististing installed plugins to files. Then, it reads TWICE(instead of once) ALL(instead of only the needed) newly created hook/plugin files, every time you access a forum page. In other words, you process a lot of unnecesary data. Since when reading many files in block is faster then reading a small piece of data from a database table? I might be wrong, since I only examined the class included in the plugin files... Feel free to comment on this, we are here to learn, not to put down other coders.

Why not just leave it the way it is made by vBulletin and install eAccelerator or APC?
eAccelerator, on top of caching the queries, it optimizes the PHP code also...