buttons pop out too late

provide more info

They go in and take a few seconds to pop out and redstone turns off late too

the few seconds is intended for the button, when the button pops back the redstone turns off at the same time

i mean they take like 5 seconds instead of exactly 1

server side lagg??

its in single player. never had this problem

single player actually is a server, just one nobody can enter

[18:49:54 INFO]: Client> [18:49:54] [Server thread/INFO]: Stopping singleplayer server as player logged out

so what can i do

increase memory, no other idea's