Why do I receive "Internal Server Error" and how to fix it?

This kind of error appears usually on websites hosted on shared hosting solutions. Such hosting usually has a certain number of CPU threads that can run in parallel and when this limit is reached it will start returning such "Internal Server Error" messages.

Here are the usual steps to address this kind of issue:

  1. make sure you don't run already a CPU&HDD intensive task like making a backup with your website. If you're running such a resource-intensive task just wait for it to finish before trying to run the image optimization again
  2. check out your plugins and see if you have 2-3 plugins that you could temporary deactivate. Once you deactivated them just try again to run ShortPixel Image Optimizer, on most occasions doing this frees up enough CPU resources to be able to finish optimizing the images on your website. 

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