Graphhopper version 2 system requirement

Hi
Please can someone let me know what is minimum memory size required to build graphhopper latest version(planet data)and how much user it can handle.

Currently graphhopper version is 0.13 and server configuration is 124GB RAM and 32 Core. When 4000 hits comes to server in 1 minute then all the RAM(Java Heap Size 100GB) and Core are Full.

Any reply would be helpful.

Thanks

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