Memcache is an excellent tool still and VERY reliable.
instead of looking at this issue from the perspective getting down the who is faster at the < 100 ms range, look at the performance per "class" of the software.
- Does it use only local ram? -> fastest
- Does it use remote ram? -> fast
- Does it use ram plus harffffdisk -> oh hurm.
- Does it use only harddisk -> run!
