[Qt-interest] Qt 4.6.3 QApplication constructor (Windows 7) EXTREMELY slow?

[william.crocker at analog.com]

Can you profile one of the slow starts.
On Linux I would use Quantify.
On windows?

Paul Miller wrote:
> Just spent the last 2 days tracking down an intermittent performance 
> problem with QApplication construction.
> 
> Symptoms:
> 1. on my machine, everything was fast - QCoreApplication would 
> initialize consistently in about 60ms (release mode)
> 
> 2. on 2 tester machines, and on a completely clean Windows 7 x64 VM, the 
> same app would start up sporadically quickly, but then every now and 
> then (every 5-10 runs) would take about 16 seconds longer on the 2 test 
> machines, and about 10 seconds longer on the VM.
> 
> 3. after awhile, the test app would ALWAYS take 10 seconds longer than 
> usual to start up on the VM (as I said none of this happened on my dev 
> machine so the VM was all I had available to test with). Results were 
> consistent with 2 off-site test machines.
> 
> I switched back to 4.5.3 Qt dlls and everything started working properly 
> on all machines, and QApplication init time went down to about ~1ms.
> 
> Note all of the test machines were fairly clean, with no standard Qt 
> installation and pretty stock runtimes/patches installed. Basically just 
> test app + required Qt dlls in a directory. Development machine was 
> loaded with Visual Studio, various runtimes, various Qt installs, etc. etc.
> 
> Anyone seen anything like this? Is Qt 4.6.3 doing something radically 
> different during app startup now?
> 
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