Very slow large cache deletion

Hello,

I love your plugin, but I have noticed that when clearing a “large” file cache of at least 10,000 or more files it is not efficient, putting the CPU at 100% on my servers. I think to do the “clear site cache” you use php functions like unlink and rmdir iterating the object cache. Would it be possible that you could make a modification in the plugin to be able to choose a method of deletion delegating to the bash system using php shell_exec(rm -fr /path to delete) or similar ? Thank you very much.