Spinning forum on phpBB 3, messages about 100000, the size of the database now it's 300 megabytes.
On the main forum page, about 130 queries at a time, in sections of the categories of ~70.
How to optimize? With the move of the caching plugins are not found, only some makeshift method of fastening memcached.
UPD: put APC, relieved. But looking for a solution on the side of phpBB, to reduce the number of queries.