Like
@gapplegal said, the recommended version for Factions is 1.8.9 -
however, you should still be able to play on higher versions.
If you’re using 1.8.9 and
still experiencing this issue, I can only recommend trying out OptiFine or the badlion client if you’re on a Windows PC/Laptop, as these tend to help out with performance issues.
Failing all that; it may be an issue with your personal connection.