Redstone line with 1 Repeater set to 1 tick and 2066 Instant repeater takes around 7 sec to turn on and between 16 sec and 36 sec to turn off, while in 1.8.9 it takes only 1.3 sec to turn on and around 5 sec to turn off.
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Can you reproduce it in 1.10.2/16w36a or later?