Comment by IfOnlyYouKnew

Here's some comparison of input lag:

    # Title              Min    Max   *Avg*   SD
    1 iTerm 3.3.0beta16  11.2   33.6   15.9  3.4
    2 iTerm 3.2.9        10.8   29.5   21.3  4.5
    3 hyper 3.0.2        22.3   46.9   27.6  3.6
    4 Terminal 2.9.1      2.4    8.3    5.8  0.5
    5 Alacritty 0.3.3     5.2   16.8    6.3  1.4
    6 Kitty 0.14.3        7.7   11.6    9.6  0.8

Measured using https://github.com/pavelfatin/typometer

Edit: Added iTerm 3.2.9 (2) added alacritty (3) added Kitty