Public bug reported:

Hi, I'm running into weird performance problems which
are only related basically to how stuff gets scrolled.

It seems fastest way to travel text is using page up/down
keys and avoid mouse wheel entirely.   (.../ubuntu/+source/linux/+bug/1835677)

Furthermore interaction with scrollbar might break something 
(.../ubuntu/+source/webkit/+bug/1830748)
which leaves only viable scrolling options
Page Up and Page Down.

And these in turn seem to suffer from direction changes,
let me demonstrate:

[       ]  <-- this is scrollbar


Travel in only one direction:

[Page Down  -->        ]   
[        <--    Page Up]


How to reset speed if it gets slow:

[Page Up         ]     
[       Page Down]     
[Page Up         ]     don't hit last position more than one time


* delete browser image cache if you accidentally press scrollbar and
restart browser

** Affects: webkit (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: webkit (Fedora)
     Importance: Unknown
         Status: Unknown


** Tags: cache

** Bug watch added: Red Hat Bugzilla #1727998
   https://bugzilla.redhat.com/show_bug.cgi?id=1727998

** Also affects: webkit (Fedora) via
   https://bugzilla.redhat.com/show_bug.cgi?id=1727998
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1836014

Title:
  Scrolling implementation is simply broken

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