[keycloak-user] Keycloak get access token performance test encounter out of memory

Hello, Below is my keycloak start parameters(domain): I use jmeter to do the performance test by invoke the get accesstoken . Concurrence 300 per second. 1st time I can see the QPS is around 1200 , but a few seconds later , it QPS is down to 600. Then I stop the test , and start the 2nd round test. I found the QPS is only 400 , and also the value is always going down. At last I saw the log out of memory error like below: Is there any solution on this ? Thanks & Best Regards Yann Chen