Lsass.exe high CPU usage and causing request queuing on webserver
Solution 1:
After enabling TLS 1.2 (also 1.0 and 1.2) on Windows 2012 R2 and 2008 R2 SP1, process lsass.exe began to overload CPU. I used the IISCrypto40, click "Best Practices", and in "Key Exchanges Enabled" left enabled only PKCS. After it, the load on the cpu returned to normal (5 - 10%). p.s. sorry for the poor english IISCrypto preferences
Solution 2:
Check for malware. I've caused this by migrating meterpreter to lsass because it grants me more permissions.
I'd also look at process explorer, and see if you can see what threads are causing the high cpu.