Results of my workaround on your test image: 

C:\test>1177606 vrtest.png
C:\test>1177606 vrtest.png
No thread
---------
Took:0.818306923
Count: 145

Thread
---------
Took:2.834208012
Count: 145

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In reply to Re^3: Why this code is so slow if run in thread? by BrowserUk
in thread Why this code is so slow if run in thread? by vr

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