If LXDM really was a problem, then it solved with Trisquel 7 that uses
LightDM.
To actually discover the problem, you need to take a look at the resource
(CPU, RAM, network) usage when the system is slow. However, like everyone
else here, I am pretty sure you run out of RAM when viewing heavy Web pages.
Your system then uses the hard disk as a complement. Accesses to the hard
disk are something like 100 times slower than accesses to the RAM.
To sum up, and if your motherboard supports it, buy more RAM. 2 GB cost very
little nowadays...
