Plexus,
You appear to be missing my point entirely.....and because of such, have apparently found my post offensive, in some way to you...
Giving such offense was never my intention.
What I am trying to get across is that there are several possible reasons for suddenly getting overloads in conjunction with Logic Pro X 10.2.1...
Those are the reasons I listed as obviously there has been some changes in 10.2.1 that are causing or triggering such behavior and with the right troubleshooting some of the negative end results of these changes.. can be eliminated or reduced.
As can be seen from the 10.2.1 change log there have been many tweaks and changes made to LPX, some of which may be at the root of such issues... but not necessarily ones that will be fixed by a further update to Logic itself.
Instead, as just one possible scenario... it may well be that certain 3rd party plugins (or hardware drivers.. or whatever else) will need to be updated so they work smoothly within the new libraries, routines and frameworks in OS X that Logic now appears to be using... as again, it obvious not all systems and setups are being affected to the same degree by the update.
This leads to the possibility of the specific causes i listed, as being part of, if not wholly so, of the problem and if one looks at such possibilities you might be able to eliminate/minimize the overload issue yourself...
In every case to date, that I have consulted on with my clients.. I have identified such issues as i listed that once fixed, again either eliminated or reduced the overload issues to the point the systems became quite usable again.
My own systems are all stable now, yes. This is not to discredit anyones else's reports.... Its simply a fact that has to be taken into account as again, its part of the troubleshooting process... If it were an issue that affects everyone.. that would indicate with much more reliability, that it would take a fix from the Logic Devs or to OS X.. to resolve such issues. The fact it doesn't affect everyone, changes the playing field, so to speak and so such resolutions may need to come from other sources depending on the specific causes found through proper troubleshooting.
It's also worth noting that in the past such performance issues were also identified to only affecting certain people because of the specific workflows they were using... Examples.. leaving multiple EQ's in 'analyze' mode... or using certain combinations / orders of certain plugins in their projects that for some reason became a less optimal setup after an update to Logic. Tweaking their workflows improved the performance of their system by some degree.
Anyhow..
if you choose not to troubleshoot the possible issues yourself but instead either roll back to earlier combinations of OS X and/or Logic or wait for some indeterminate period of time.. for some possible fix.. from whatever source, thats entirely up to you. I'm simply saying that with a bit of work on your own behalf, you could be back up and running.. without any such delays.. Note: I said could be.. not will be...
Again, the choice is yours as always.
Cheers..
Nigel