When using a Videoin/Camera in beta17 and newest alpha the Mainloop only runs with max 30 FPS. In betas 14 and 16 everything is just fine (Mainloop ~60FPS).
I tried with 3 different cameras:
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IDS uEye 5640 (Gigabit Ethernet)
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ImagingSource DMK 31Af03 (Firewire)
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Logitech Quickcam Orbit (USB)
And 2 PCs:
Win XP Home 32 Bit SP2
NVidia Geforce 7900 GS / Latest Drivers
Win XP Pro 64 Bit SP2
NVidia Geforce 8800 GTX / Latest Drivers
VideoInFrameRateBug.v4p (8.4 kB)