I don't want to work with the grid, in my mind, it's not very useful, this can produce an honest mistake and i think that slow down the display. I have deactivate the grid display but qcad continues to snap the grid (and i think qcad continues to calculate the grid spacing). I don't find the option, but I seem to recall that in the preceding versions that can possible.
The second suggestion is to produce an option with a zoom speed.
Thanks for your soft.
Baptiste - the French guy with bad English