After installing Dorchester (a few days ago), I worked on a new project yesterday with multiple midi/audio tracks and didn't notice any issues at all......I even (accidentally) opened up an older project and noticed it loaded up within seconds.
It's odd that these updates tend to work out well for some and not so well for others. I hope all of you get this resolved quickly.

Ifm, I do submit the bugs per the automatic fault reporter, which likes to crash too. To quote Mudgel, "I can't quite put my finger on it", but it's not as smooth as Cambridge, and opening projects is becoming an issue.
 
Ludwig

lfm
 
I think I saw a transparent dialog there at the end.
Did you try turn off transparency in Windows theme?
 
Transparency means all windows covering each other needs to repaint from bottom up - every time a repaint is needed.
No idea, if this is significant on your system - but worth trying.
I just hate it and turn it off for that reason.
 
And I come to think of the 20s-30s delay I encounted some time in between, that I feel might be Sonar checking for updates.
 
Once Sonar is loaded - what is load time then of this project?
 
I can't say this any abnormal - if first startup of computer and a number of sample based libraries are loaded. SuperiorDrummer full bleed, 1.5G, of booted computer takes 10-15s to load on my system.

HI Lars, that transparency is just me turning off the onscreen video program, it's not anything I ever see normally.
 
To simply start SONAR from the .exe, as opposed to opening a project as I did in the video, takes about 10 seconds, so the project itself took around a minute (1 MIDI Track into Superior Drummer; 6 Audio Tracks).
 
 

Example: The project I JUST opened - flatlined EQs and Zeroed compressors in PC..
 
Never mind, can't get it to paste and upload.

SteveStrummerUK
 
Here's my load time for Dorchester in real time:
 

No video ... not saying you're not having problems ... just providing a data point for comparison.  I just started S-PlatD by opening a project with acouple of audio tracks, an instance of Guitar Rig 5, EZ Drummer and two Rapture Pro instances.  The first RP is loading a DimPro legacy piano program, the other a Rapture Pro factory cellos program.
 
Total time to load was 25 secs with the same project having been previously loaded.
 
I emptied the Windows standby memory (cache) and timed it again ... same time within 2-3 secs.

SteveStrummerUK
 Here's my load time for Dorchester in real time:
 

 
Mayebe it's of no consequence in this case, but it would be best not to demo a SONAR performance problem with a potentially resource-hogging app like Photoshop running.
 

I'm finding some of this too...

Outside of bugs such as not saving the control bar state, all the releases have been stable...

But Dorchester continually crashes simply by changing/loading/closing songs...

I have sent a few crash reports, but my web access is so limited I couldn't send too many...

I haven't had this kind of trouble in a very long time...

Keni

My load times are about an Instant to 2 seconds (for more than 100 tracks w/plug-ins), and I "Don't" have Clients Looking over my Shoulder! but when they bring me Files that they've worked on at other facilities, they want the job done right. I've haven't had as many "Bugs" and crashes are very rare, but I also record in many Professional studio's.
 
I still enjoy Sonar.................  

Hay MANTRASKY...Need to ask a question, how long are those 100 tracks?...to get 2 second load times?...it takes more than that just to scan my plug ins...never mind draw in the waves on each track which takes , too long in my book...I could cook a full meal, and make coffee, and have desert by the time some of my 26 tracked projects  load up.
 
If you tweaked something...(shhh) they do not like that word around here.....Let us know what is, or your system specs, so we can enjoy that bliss also ....wink.

Dorchester has been pretty stable for me. No complaints here. 
 
I think it's funny to hear people describe previous releases as "crisp and snappy" when compared to the current version. Every damn' release you hear the same story. X3 was slow and bloated compared to X2, etc etc. 90% psychological, in my opinion.