hello @moosaes
As I can see, your website is having heavy load with Total Blocking Time(TBT). In order to Improve website speed we need to:
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Remove unnecessary code on a high priority basis.
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Reduce JavaScript execution time - Minimize main-thread work
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Beware of excessive liquid loops.
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Weigh the benefits of installing another app By fixing these issues, your website speed score can definitely improve.
I have checked your site in the Google Page insights tool. There is a low score on your website. It needs to be improved, especially on mobile devices. As I can see your website is having a heavy load with Total Blocking Time.
especially Google Tag Manager affecting heavy load on TBT
here below screenshots, you can see that’s affecting TBT
