I also noticed that Sean does a replacement of the small size fonts with large size fonts in a specific way to speed up rendering of larger font (In his Configuration that does Preferences). I've got eyesight issues, so I am also using larger fonts. That doesn't help with speed indeed.

But the Paragraph rendering code is also a culprit I think, as it endlessly recreates objects all the time.

Morphs with step methods and a short stepping time are pretty fast. I've a educational game on the iPad that uses this and it is pretty nice in terms of rendering speed (dragging and dropping formula pieces around).



---
Philippe Back
Dramatic Performance Improvements
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On Tue, Nov 26, 2013 at 8:27 PM, Esteban A. Maringolo <emaringolo@gmail.com> wrote:
2013/11/26 phil@highoctane.be <phil@highoctane.be>:
> Pharo really needs a huge speedup on the UI front. I am using a top of the
> line desktop system and still Pharo sometimes feels slow (some is due to
> algorithms - like the finder tool taking ages for a lot of things, but some
> is due to the UI system).
>
> This is not linked to the VM, as the MVC projects in Squeak are uber fast.
>
> Is the Text rewrite going to have an impact on this?

It doesn't feel slow, it is slow. Perfectly usable, though. I even
feel it was faster before.

But I think the problem comes from the "rendering" side, and not
because of "not UI" operations running in the main thread.


Regards,