ViewSonic LS610WHE User Manual page 38

Menu Option
3X Fast Input
This function is favorable to frame rate reducing. Quick
response time in native timing can be achieved. When enabled,
the following settings will return to factory preset values:
Keystone, Corner Adj., Aspect Ratio, OverScan, Zoom.
NOTE:
This function is only available when a native timing input
signal is selected.
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Description