a) When some file is read, some eBoostr’s thread (for example with Idle priority) should check statistics and when this file is read often, it should be placed to cache immediately (and not on next cache build). When there’s not enough space in cache, some unimportant (or obsolete) file should be removed from cache at first.

b) eBoostr should use file deletion handler and when some file is deleted from disk, eBoostr should remove it from cache immediately (and not on next cache rebuild)

I think these two suggestion would optimize cache usage.