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SSL is dead slow in Internet Explorer + Safari

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I had a Comodo SSL certificate installed on my website yesterday, after going through a lot of trouble it has finally been activated.
I am, however, experiencing serious issues in Safari and Internet Explorer 7: page loads are dead slow, and most of the times the pages are only loaded partially - often they arent loaded at all. Chrome and FF show no delay.
Additionally, Firefox 8 won't accept the certificate - however that's a marginal issue, the website targets a very specific audience, with 99% Internet Explorer visitors.
I don't have access to the webserver itself, I have to rely on the support theme - and my current contact doesn't seem very competent. It should be fixed by tomorrow however, since the website will get an external security audit on Monday.
The website contains one static HTML that can be used for testing: https://axa.tfo.be/incentives/cipres/static.html

My question:

Any ideas what might be the problem, so I can point support in the right direction?

Clemente Echevere Aug 16,2020

@MarkHenderson I'm sorry, I realize this goes against StackExchange policy - but I'm really desperate for an answer. It's a very important customer, and they have planned a security audit tomorrow. Thanks for not closing the question.

Andryukha Rezerford Aug 16,2020

Do you see the same issue over non-ssl traffic? Also, do you repeatedly see the same issue? I saw what you describe the first time I loaded the page, but subsequent refreshes seem to be OK.

Clemente Echevere Aug 16,2020

@MarkHenderson no, non ssl traffic goes fine, no delay at all. Subsequent refreshes in IE show the same delay, however. Still no response from webhost support...

Andryukha Rezerford Aug 16,2020

I'm not 100% sure on this as I can't reproduce it every time, but it looked like it was taking forever because of the OCSP check. Can you purchase another $5 certificate from somewhere else to try another one? I've used cheapssls.com in the past.

Warm tip !!!