Please open Dota 2 issues here: https://github.com/ValveSoftware/Dota-2/issues
This repo is for steam client issues.
Closing this as @rkfg suggested, we are taking DOTA issues over there.
The chat font issue is known, and the performance issue has a report too. The Roshan bug sounds more like a cross-platform issue and might be better placed on dota forums.
Nothing extracted yet.
When typing the chat box the font is way to big, I can't select all text to remove it nor does backspace work.
While loading into a match server, there is a black screen instead of the Dota logo and it lags a bit. At Post-game my performance drops significantly, otherwise the game runs smooth disregarding the heavy lag when players have selected their hero and joins the map.
So I had my most horrible match every. The opposing team managed to attack Roshan during the Preparation and killed it off only few seconds after the first creeps had spawned. This gave them not only aegis of immortality mere seconds into the game but a few extra levels. It's something that I feel should be looked into. Ursa and Skeleton King were the key heroes to pull this off.
At the time of writing I cannot download the replay, but I will try and provide it to backup my claims.