Ender 3 V3 Plus retraction issues

When i try to print with support my extruder clogs up halfway in the print.

Printing in 250 mm/s and my retraction is set corretæy.

Why does it do thsy evert time i have a print with support?

The printing speed of 250mm/s is relatively high, which can increase the difficulty of filament extrusion, especially when printing support structures. Try reducing the printing speed to see if it improves the issue.

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So i will try to print with 200mm/s but what is the optimal retraction speed and length?
Is there other things that i should take consideration for?