I have Sonar Artist and it takes 40+ minutes to load. I previously had Sonar x3 which took just as long to load...which is why I bought Artist. I have Windows 10 64. I have HP 500-017c computer with AMD Quad Core AB-5500 Accelerated Processor, 8GB DDR3 system memory, 1TB hard drive. 

Look at the windows Event log.

Hi. If you list your specs (OS, CPU, RAM, Audio Interface / sound card, video card etc) it will be easier to help.
All the best.

Re-Install Windows then install SONAR again...fixed.
 
-S

This doesn't seem like a Sonar problem at all to me.
It sounds like either:
 
- Bad Hard drive
- Possibly bad RAM
- Failing CPU
 
But more often than not, it a bad hard drive. I would do a Check disk.
To be honest, it's very difficult to make any predictions/suggestions when you haven't listed your specs or devises.

chuckebaby
This doesn't seem like a Sonar problem at all to me.
It sounds like either:
 
- Bad Hard drive
- Possibly bad RAM
- Failing CPU
 
But more often than not, it a bad hard drive. I would do a Check disk.
To be honest, it's very difficult to make any predictions/suggestions when you haven't listed your specs or devises.

As suggested, I would check the hard drives first. 
Windows 7 https://support.microsoft.com/en-us/kb/2641432
Windows 8 / 10 http://www.thewindowsclub.com/disk-error-checking-windows-8
 
I had an experience with an external USB hard drive that was going bad, caused crazy slowdowns on the PC it was attached to, until I unplugged it. 
 
Take a look under Disk Management at your internal drives(s) partitions.  Look for the "Healthy" status.
 
This CrystalDiskInfo is also a handy free utility to look at your disk health with http://crystalmark.info/?lang=en
 

My largest projects take about 30 seconds to load. Check drives but also synths loading samples. Create a few project tests. Some with only random audio. Do ALL of your projects load slowly? Even the smallest?

Before trying any of the suggestions here, consider backing up your hard drive just in case it is getting ready to fail. 

Yeah, I agree with the bad hard drive diagnosis.  Check the Event Viewer and see if there are loads of "Disk Error" entries in System.  Run Chkdsk.
 
Maybe you are out of disk space???
 
Bad RAM usually results in BSODs.  But maybe you have too little RAM?  Or maybe your pc is too old (slow CPU).
 
Maybe you have a lot of malware/virii installed? You should have a second computer for all your naughty business.
 
Check Device Manager for devices with yellow exclamation marks - this usually means that drivers are not installed.  Also make sure you have the latest drivers installed for your system.  If you have a kick ass pc but the vendor's drivers aren't installed your pc will use the generic drivers and you will not see the benefit of having kick ass hardware.
 
Maybe some other piece of hardware is failing, disconnect all non-essential hardware and test.
 
 
 

I had for 2 years two computer running for analog recording tape machines (digitazing) with 400 MHz and 2 GB RAM (Windows XP). They started X2 (empty project) in 20 seconds and recorded projects with over 100 GB.
Do you have Windows 10 installed on a Pentium III computer with only 2 GB RAM?