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Some lower priced keyboards have fairly slow scan rates. So, it depends upon where it is at on the scane when you hit the key. That will cause a noticeable lag.
Almost ALL proline stuff has a keyboard scan rate of at least 600kHz. (Based upon a 61 key manual.) So, even with 88 keys, the longest time lag one should get is about a 7th of a millisecond. MIDI lags are longer since they don't transmit note commands at the internal scan rate.
The type of key, weighted, touch synth, or non-touch, isn't what creates the issue. It's one of electronics.
The one thing to look for in some weighted actions is the actual response after escapement time. There are some that are a little mushy and the rebound of the key is a little slow. So, when you play fast, around the same few notes (a repeating arpeggio, trill, or mordent), the key is still coming back at you while you're trying to play it again. (Like the older Rhodes Stage models or the really old Wurlitzer electric pianos.)
The best keyboards with weighted action i've played are Kurzweil, then Roland, then Alesis, then Yamaha. I went with Alesis because it was a full synth, not just an e-piano, and the features for the money were great. I've used Alesis and Ensoniq for a long time and they are as bulletproof on stage as Yamaha. (As XNASA mentioned.)
Final part of this long winded answer: One of the best, most responsive and fast synth action keyboards ever was the Yamaha DX-7. That wasn't weighted, and up to that point, NOBODY had even played a board that quick and easy to play. So, there's no difference to the circuitry for the type of keys. It's all in how much they spend on the CPU and RAM that runs the whole thing. The Professor
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