How can I reduce loading speed of Saas based website

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What exactly is the required speed?

How do you define that? Is there a Benchmark telling this? If yes, which one?

BTW: why are you asking this here? You are not using CloudFlare as your NameServer and therefore not as DNS and also not using any CloudFlare service.

This is a Community Forum for the CloudFlare community. So for people which are actually using CloudFlare, but you are apparently not.

And that might also is the answer to your needs. You are not using CloudFlare, change that and let CloudFlare speed up your site.

You are using SiteGround and Google, not CloudFlare