75mm/s at 0.2mm layers should be fine
What Didier said. Just to get to the root cause, try to increase the temperature and print slower - even 30-40mm/sec.
If that goes well - the print head might need some cleaning - look for the "Atomic Method" to clean the head.
Actually, performing it never hurts anyway.
Maybe you still have the same thing with 100% infill but i shows less?
This is under extrusion, http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#underextrusion
75mm/s at 0.2mm layers should be fine, depending on your temperature (i would increase it to 220°c assuming it's PLA)
Or reduce the speed to 50mm/s
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