Slow internet...

I"ve a DSL connection, suddenly today pages (this forum for example) would not complete loading after even 15 minutes, subsequent tabs would never or seldom result in the webpage appearing. Ran a script in /etc to switch to a mifi dongle[1], and everything is dsl-speed again on the USB antenna >> mifi >> mobile internet. Would anyone know if it is a DNS setting, or the particular DSL provider slow just today, or a combination of the two? Or rather, has anyone solved a similar problem by changing a DNS setting or method?
[1] reboot required. Likewise the other script to switch back.
Thanks.
[I only slightly was worried about it having to do with yesterday's libxcb etc upgrade. Appears not relevant ... ]
 
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