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Browsing is slow when I use proxy PAC file, but webpage loads normally when I use proxy IP

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Webpages will load very slowly if I use Proxy PAC file in Firefox browser wherein it loads normally without any delay when I configure proxy IP in the browser internet settings. Tested it in other browsers and did not find any slowness there. Is this the normal behavior of FireFox browser or I need to change any settings?

Webpages will load very slowly if I use Proxy PAC file in Firefox browser wherein it loads normally without any delay when I configure proxy IP in the browser internet settings. Tested it in other browsers and did not find any slowness there. Is this the normal behavior of FireFox browser or I need to change any settings?

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Hi,

by experience, when there is a proxy, it is better to use fixed ip the pac you're talking about, I don't know it. It will be difficult to answer, but maybe some documentation will give an additional tip

Thank's