My web-browsing suddenly slowed to a crawl last night. I knew it wasn’t my internet connection, because my Window$ laptop was still working fine.
The problem seemed to be with resolving domain names. So in Window$ I checked my DNS nameservers (using ipconfig /all) and found that on my Linux box the nameservers in /etc/resolv.conf were different. I put the correct nameservers from Windows into /etc/resolv.conf and voila! – normal service was resumed and I can browse again.