For starters you're running with the default cache size of 8MB ... which is way, Way, WAY too small.
You'll need to increase the size of the default data cache, and you'll likely want to create a 128KB pool to support queries that can benefit from large IOs.
- sp_configure 'max memory' => add memory to the dataserver (if you don't have any free memory to allocate to the default data cache)
- sp_cacheconfig => increase the size of the default data cache
- sp_poolconfig => create a 128K pool (also used to size said pool)
This is just a bare bones outline for reconfiguring your cache. There could be other configuration settings (for the cache, for the dataserver) you'll want (need?) to make for you environment ... and that's a rather lengthy dissertation.