Question regarding memory usage (swap, buffers)

[cirdok2]

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)

# 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:

[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?