Hi Eliza,
you maybe want to check how much memory FoE had allocated with your taskmanager (everything over 1 GB slows the game or any typing)
To prevent this relog once every hour and you won't have this problem.
Especially after you visit many neighbours to boost them.
Firefox plays FoE in the "plugin-container.exe" so you may look for this process.
If it's still to slow watch you cpu load, something like that could also be came from other programms.
Greets
Funonline