How to avoid GTmetrix “Analysis Error” – 503 Service Unavailable?

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Your server might has an overload. Almost every hosting company offers fixed amount of resources for each hosting account. For websites on shared hosting, this limit cannot handle heavy usage of server resources. Building cache can use lots of resources.
Troubleshooting steps:
  • First of all we suggest to exclude post types that you wouldn’t like to cache. Autoconfig should find most and exclude them automatically but you also can add manually.
  • Also if you enable optimization features it will use more CPU. You can try to disable Critical CSS or exclude third party JS and CSS.
  • If the above suggestions don not resolve the issue, you can also enable Optimize in background instead of Prebuild only, and disable automated prebuild.
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