Newer 2.8 looks better then 2.72 but there is bug. Too much is putting to undo/redo stack (structure). Sometimes i think Ctrl+Z doesnt work, but work after big delay. Maybe the problem exists only after Play song - maybe some “play event” is added to some “undo queue”.
What kind of events do pass in your song and is this reproductable on every occasion?
Every each change note, especially alt+(f1 or f2) cutting ctrl+x and then play i must press ctrl+z more sometimes more than 10times - more play song more times. Is there somewhere 2.72 release or previous. 2.8 is too slow. I have phenom 4x 3,4Ghz to this moment its step backward its with plugin containers - maybe its not finished/optimized i hope. 2.72 sometimes in few songs extremely “Crashnoise” i was affraid about own ears - just played to moments when it usually crush - if not it not crushed 
In 2.8 problem is solved, but again very often cant close DSK or DVS Vst plugins correctly… (+) Adding new patterns is much easier.
My suggestions by the way:
- samples instruments should have been played even they are not beggined - mixing vocal is frustrating when it has long stream.
- in “loading song part” should be not only render. It might to appear tool to close in some rectangle/polygon block some part of the track, and to d&drop from top part of Renoise.
Where can i download previous version 2.7 or 2.72? Version 2.8 is very irritating. I hope this very good product doesnt turn to trash. 2.8 shouldnt appear (i understand 2.8 beta).
Enable “Autoseek” in the Sample Properties:
http://tutorials.renoise.com/wiki/Instrument_Settings#Sample_Properties
You can download your old registered versions of Renoise from the Backstage area:
http://backstage.renoise.com
It would still help us a lot if you could provide some more details about this problem you’re experiencing.
Perhaps you can send us a small demo song which is affected by it?
Maybe you can experiment a bit more with your settings to see if anything is really different from 2.7 to 2.8?
If you’re using 2.8 64-bit, perhaps you can try 32-bit instead to see if it performs better somehow?
I think this is about undo performing very slow when the “Autosort sequence” is enabled, i’ve lost the link to the topic (Danoise popped it up i thought), but i thought Taktik mentioned having a fix for it in the next maintenance update.
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Thanks 
Very helpfull “Autosort sequence” it looks like my problem with undo-redo. It’s sorting maybe when song starts. Before play, problem doesn exists. Im installing 32bit version, and I think its problem like in other posts. Very lot of plugins are 32-bits. Rn32 works maybe even faster than 2.7. Closing plugins still failed like in 2.7. No redo/undo problems. Good job Thanks again