Grin node taking high CPU load

I’m running some nodes for GRIN and notice that the grin process taking so much CPU resource (compared to zcash or monero) .
This is because of the code optimization or hashing algorithm? I do not mine within grin node.
Any ideas?
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More peers more cpu

20190627 11:48:53.471 DEBUG grin_servers::grin::seed - monitor_peers: on 0.0.0.0:3414, 183 connected (160 most_work). all 4631 = 182 healthy + 3 banned + 4446 defunct

34%

20190626 23:24:30.723 INFO grin - This is Grin version 1.1.1-beta.1

Update to last version