When I copy some big files on my NTFS USB hard disk, 80% of my CPU is
used and speed decrease to 9Mb/s instead of 30mb/s.
--
Huge CPU usage by mount.ntfs process
https://bugs.launchpad.net/bugs/392204
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solution :
in Firefox address bar:
about:config
and change the following lines like this :
browser.turbo.enabled: true
network.dns.disableIPv6: true
network.http.pipelining: true
network.http.proxy.pipelining: true
network.http.pipelining.maxrequests: 4
reboot firefox
Livebox slow firefox
