Question regarding memory usage (swap, buffers)
 

On my new server currently used as test, we are still experiencing awfully slow queries.

I ran free -m and the result is:

new server (1 user browsing)

Code:
# free -m
total used free shared buffers cached
Mem: 2048 2008 40 0 8 1566
-/+ buffers/cache: 433 1614
Swap: 2047 0 2047
while with our "old" server (>500 users browsing), that runs just fine, we have:

Code:
[oldserver ~]$ free -m
total used free shared buffers cached
Mem: 2048 701 1346 0 0 0
-/+ buffers/cache: 701 1346
Swap: 0 0 0
I am no expert in this, how can I interpret this values? Could be this the reason for slow queries?