I was having issues recently with Arena being Laggy/stuttering. Basically every 3/4 seconds the game would freeze. Game used to run well, this is only a recent problem. This would eat inputs and made it nearly impossible to double click. I uninstalled and reinstalled the steam version alongside rebooting my laptop.

Workaround: I downloaded the standalone installer and that version of the game is working well with no stutters.

I would prefer to run the game through Steam so I hope this gets resolved.

This has been alongside the "Asset Failed to Verify" bug that has happened on both versions. I get that warning every time I boot the game, but it seems to work fine afterwards (Besides the stuttering issue on the Steam version)