I can confirm this issue too.
If Arma3.exe (client) is started as administrator, the showed ping times are realistic, if arma is started under normal useraccount a lot of servers (not all) in the list showing ping time of 2500 or an empty field for this value.

As long as BI has no native solution for better (multithreaded?) script processing, it should be possible to use this HC (dedicated client) as a workaround.
(I know the Arma 2 engine a bit. A few months ago, i tried to reduce the login-time on full, long running dayz servers :/ )

I think it would be fair to make use of HC possible, without paying for one or more extra licences.

... what a difference, thanks for your work NordKindchen ...