You can run benchmarks, like me. And post all your output, here.
$ grep VGA /proc/pci || lspci | grep VGA | colrm 1 4
$ egrep "model name|MHz" /proc/cpuinfo
$ xdpyinfo | egrep "version:|dimensions|depth of"
$ glxinfo | egrep -A2 "direct rendering|OpenGL vendor"
$ uname -a
$ vblank_mode=0 glxgears & sleep 30 ; killall glxgears
$ vblank_mode=0 glxgears & sleep 30
with installed "glmark2" (must to change resolution to your hightest one)
$ glmark2 -s 1920x1080 --annotate
with installed "glmark2-es2" (must to change resolution to your hightest one)
$ glmark2-es2 -s 1920x1080 --annotate
with installed "glmemperf"
$ glmemperf
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Run benchmarks before updating drivers, and write outputs to some .txt.
If something goes wrong with updated drivers, you can remove repository and
downgrade versions to Trisquel's ones.
If you want to update your drivers (THIS IS AN EXTERNAL REPOSITORY; NOT
TRISQUEL'S ONE; IF YOU ARE NOT SURE; DON'T INSTALL THIS)
https://launchpad.net/~xorg-edgers/+archive/ubuntu/ppa
$ sudo add-apt-repository ppa:xorg-edgers/ppa
$ sudo apt-get update
$ sudo apt-get upgrade
