.NET LargeObjectHeapCompactionMode

[KindDragon]

Have you tried with LargeObjectHeapCompactionMode?

https://msdn.microsoft.com/en-us/library/system.runtime.gcsettings.largeobjectheapcompactionmode.aspx

[zapov]

No, but I doubt it would help.
Only place where that would make sense is large bench, but it does only up to 1000 runs.
There is no GC.Collect() inside bench, since it starts, loops through it requested number of times and exit.

Feel free to try and get back with results.

[KindDragon]

Ok, thanks for info