I have a MacBook Pro with 8 GB and an i5. Yesterday I installed a new harddrive, the Samsung 750 EVO with 250 GB. I restored my old system via TimeMachine. Unfortunately I noticed very laggy behaviour. With every operation came the beachball for a second. Typing, opening programs, everything. I thought maybe it’s the old system, some weird connections that aren’t there anymore. So I wiped the SSD and did a clean install (Sierra). My system is blank and it’s still choppy as hell. Every action lags for a second. Here and there random beachballs. What can it be? There is no dot in the spotlight glass, so no indexing I guess. My SSD Firmware is MAT01B6Q. Can anybody help me please?