Specifications : Processor i7 2,3 GHz with 4 GB RAMĪfter thorough tests, I came to the conclusion that the jerky cursor movements and the MacBook coming slower and slower was caused by the battery with "replace now" status. The battery is no longer charging and the time (date/hour) is no longer remembered, so that I have to reset it after each start of the OS. Practically, it is impossible to use the laptop. The one of the touchpad is also jerky, altough to a slightly less extent. Then, performance suddenly dropped and all menus now take a while to open. After the upgrade, the laptop was running smoothly during about 1 week. I have a MacBook Pro 15'', A1286, Early 2011 which was running OS X Lion and became extremely slow few weeks after an upgrade to El Capitan.
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