Huge swings in DNS lookup times

Hello I have a site hosted by Siteground and using Cloudflare as the CDN. My domain is hosted by a South African company and I have changed the name servers to point to Siteground’s NS who in turn points to Cloudflare via a CNAME record. When testing my site on GT Metrix, Pingdom etc the DNS lookup times are extremely slow (often 6 seconds or more) with constant testing the times do come down but after a while they’re back to 6s or more.

Is there a way to improve this somehow? Is using Cloudflare as a CDN helping with DNS lookup times? Would moving my domain directly to Cloudflare help perhaps? Is it possible to reduce the chain?

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