Website is very Slow on Proxy (UK and China)

When I activate my website on CF proxy, it gets very slow in the UK and also in China. Canada (load 1.2 Seconds)and other destinations load very well. Sometimes will not load at all in China unless after several attempts and is not stable.

Without CF proxy, we load 3 secs in china, 4 secs in UK, 2.3 secs in Canada.
I am on a dedicated server with loads of capacity so not sure what’s happening here. I need some help

I am confused because it works well in other regions
Thanks

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