a) use Campsite without caching
b) find a shared hosting company that offers APC cache (or any other opcode
caches, but in that case you'd need to follow what Mugur wrote earlier to
this list/forum: http://code.campware.org/phorum/read.php?8,7296,7296#msg-7296 )
c) find a hosting company that allows its customers to install opcode
caches and then install APC.
Regarding options b and c, seems that quite a few people here are looking
for such companies. If anyone on the list/forum can suggest some, please
let us know. [I have very limited experience with shared hosting companies,
as I use a cheap virtual private server (VPS) for my own purposes.]