The R2 Group Chat client defaults to a very verbose logging level. While logging enabled as a default can be helpful when first rolling the solution out and catching unexpected errors, it doesn't help when it impacts the client performance.
As the result of a customer visit with this issue, a member of their own team found some settings they thought would be acceptable and after double checking the best supported configuration is as follows, notice the highlighted parts
<file value="%userprofile%\tracing\GroupChatConsole.log" />
<maximumFileSize value="1" />
<!-- in MB, 2047 max-->
<maxSizeRollBackups value="1" />
<filemode value="truncate" />
<level value="FATAL" />