Why is LiteSpeed running slowly on certain servers?

Please refer tho these documents for your LiteSpeed performance optimization:

http://www.litespeedtech.com/docs/webserver/config/tuning

https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:php:improve-performance

In our experience, generally speaking, most possible logical explanations are as below:

Your PHP setup maybe different amount your systems. Please verify. Try to turn on a PHP opcode cache. MySQL might be the cause as well.
Please check with a Top command output. If your PHP process uses a lot CPU resource, the bottleneck is the PHP code. If MySQL uses a lot of CPU resource, then your issue would be caused by MySql. Perhaps a table needs to be indexed.

Lastly, If CPU usage is not high, perhaps you may have some network bottleneck. It could be a failure in DNS lookup or a script has slow speed, accessing another server.


If you have any questions, please feel free to let us know.

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