Has anyone had trouble with speed on their tt

I count three speed related issues with turntables.
1) Absolute speed- this is what the timeline device can measure with utmost
accuracy. This is the least important of the speed issues with regards to how the
music sounds. If the platter speed is off 1% or less, who cares? You will not
know it unless you have a tuning fork near one ear while playing a record with
the same frequency tone for comparison.
2) Slow variation in speed. I'll define this as Wow&Flutter; which could also
include speed variation beyond the 1.8 second period if a motor controller has
an issue or if line voltage is an issue. The record itself is usually the biggest
contributor, (if you have even a decent level of turntable), to Wow&Flutter due to
center hole tolerances. If bad enough, piano notes sound sour. This is a more
critical issue than absolute speed.
3) Fast variation in speed. This is the big one. Take a look at my system page
for more detail about this. This was an eye opener for me. A lot of potential
contributors to this issue. The biggest problem here is that you may not hear it
or notice it directly; but once this type of issue is resolved you will be amazed at
the difference in sound. My contributor to fast speed variation was my
turntable's suspension system. It was causing high frequency oscillations in the
platter. Other contributors to fast variation in speed could be due to cycling of
closed loop controllers about the speed set point, speed controllers that
constantly adjust speed, motors with too little torque to overcome stylus drag
during loud passages, or motors with too much torque and also belt problems.

I believe that listening is the final test in evaluating a system; but I also believe in
using measurement tools to reduce time and trials in getting to that final
listening test. I put a lot of stock into Dr. Feickert's iPhone app. Use it as a
relative tool. I think the frequency measurements are dead on because the app
uses the iPhone's internal clock.

The motor provides torque to hold speed. Platter mass is a component of the drivetrain system and affects how the system responds to changes in load and torque. A high mass platter does more for isolation of the record than the inertia effect. That's because more platter mass requires more motor torque. I have said before that if a motor can bring the platter up to speed in under one rotation, then it probably has sufficient torque. An undersized motor will struggle with the micro dynamics. The motor and platter are part of a system. Any one of the two out of balance results in poor performance.