[npstr]

It looks like you're not up-to-date, ZGC has pauses on the microsecond dimension. Even since before ZGC was added, there are open source libs for HFT that optimize allocations to avoid GC: https://github.com/openhft =3

[Joel_Mckay]

Indeed, it is likely some naive kludge like RTSJ

Tend to deprecate Java services for a number of other reasons =3