Solution is to run the native OS X version that came with your MBP.

I know everyone has different experiences, but for me, I've got a bunch of 
machines that run SO SLOWLY on the latest versions of OS X. I've installed 
SSDs, but it's made little difference. I have a Mac mini still running Snow 
Leopard and it's very responsive, no lag, just like it should be. (SL is my fav 
vers of OS X, btw). 

My other machines were upgraded to Mavericks and beyond and *all* have an 
unaccountable and very pronounced 0.5 to 1.0 sec response lag in the UI. My 
2009 MBP is fairly useless now that it's running El Capitan. Plenty of RAM, 
plenty of free disk space, nothing running on the CPU or I/O or network, no 
anti-virus programs, no Safari, yet the system response lags: slow to launch an 
app, slow to switch context between apps, slow to login/logout or to do almost 
anything. Beach ball time, all the time! Feels like Windows now.

Even on a powerful mid-2011 3.4GHz iMac with 32GB of RAM and 8 CPU threads, 
running Yosemite it lags! I'm afraid to upgrade it to El Capitan for fear it 
will become even slower... 



> On Dec 26, 2015, at 9:22 PM, Jean-Christophe Helary 
> <[email protected]>
> wrote:
> 
> I've brought back to life a 24" iMac from 2006, running only Leopard on 4gb 
> of ram, and it feels seriously faster than my current early 2011 MBP running 
> El Capitan with 16gb of ram.
> 
> The question is, what can be done to get this MBP to feel a bit faster, 
> including reboot speed etc.
> 
> I'm thinking of eventually installing an SSD disk when I have money but is 
> there any software solutions that I could use right now ?
> 
> Jean-Christophe 
> 
> 
> 
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