And how does it affect visitors?
I had over 19,000 files in my wp-content/cache folder and wanted to clear the cache before doing a backup. It has been running for 20 minutes! ... Is this normal?
I'm hoping the developer checks this support forum and can clarify what is actually going on when the cache is being cleared. This seems broken, but I hate to interrupt it and start over for fear of corrupting something.
edit: --- as usual, I continue to research after I ask a question, and it looks like according to the function "purge_cache_dir" in the plugin file purging-routines.inc.php, that all it does essentially is unlink (or delete) the files from that cache folder after verifying that they are writeable and are not folders. It also deletes the lock and log files if some setting allows that. So... I think it is safe to just "whack" all the files in the cache folder. Can anyone confirm?