Jean-Marc Lasgouttes wrote:
> Comments welcome. My plan is to use that for both Qt4 and Qt5 (for 
> simplicity). Seeing the different behavior of Qt 4.8.1 and 4.8.7 (albeit 
> different machines), I suspect that the problem is elsewhere in the 
> configuration.
>
> I would be glad to have numbers from your on systems.

Tested to see the impact on the speed of moving cursor throughout
first page of user manual (slowness reported while ago).

lyx 2.0.8 - ~14s
master(86c33c96a) - ~29s
master(86c33c96a)+your patch(no prof in config options) - ~23s 

#pmprof# breakAt: 6.88usec, count=862, total=5.93msec
   hit: 97%, 5.12usec, count=842, total=4.31msec
   miss: 2%, 81.00usec, count=20, total=1.62msec

(qt 4.8.5)
Pavel

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