XenForo Image proxy curl timeouts for slow image hosts

[Fullmental]

We've received several reports that some of the slower image hosting sites are unreliable in terms of using their image links in our members signatures. We have image proxy enabled and when I test these urls in the image proxy test in ACP they fail 9 times out of 10 due to a timeout (error 28) but they do sometimes resolve within the time limit. When I go directly to the image in my own browser it loads but takes several seconds to do so.

For some reason signatures are seemingly affected...

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