The same problem here. I practically skipped Cubase 12. A very small project ran absolutely smoothly in Cubase 11 (Rosetta2 on MacBook Pro M1 Pro) like all other projects. In Cubase 13, however, CPU overloads occur even in this very small project (1 audio track and only one instance of HALion Sonic). This is totally ridiculous! In this state, Cubase 13 is absolutely unusable for me.
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OK, it looks much better today. No idea what was going on. Phew, fingers crossed!
IĀ“m having the same problem, my CPU is Ryzen 5950x. I get a audio spike and than it mutes all audio but keeps playing the tracks if I stop and start again still no audio. I can get audio back by going into Studio Setup > Audio system and change the setting on the ASIO Guard than I get audio back.
Tried updating the drivers for my audio interface which is Antelope Audio Zen Go synergy core. Also updated the firmware. Also tried activating suspend VST-3 feature. IĀ“m running Windows 11. This is not an issue on Cubase 12.
Update: IĀ“m also running a project from Cubase 12.
Cubase 12
Cubase 13 with tracks import to new project
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not sure if multicore performance is the same or worse in 13, but I started running into dropouts when recording a couple of new tracks in 13 today. CPU always showed as high in 12 even on the same project, but never had dropoutsāagain, that could be due to not having those few extra tracks.
it does baffle me that despite having a very capable PC, Core Temp only shows one core doing work when Iām working in Cubase. usually doesnāt show much higher than 20% in Core Temp, but for some reason the overload indicator is almost always on in Cubase (both 12 and 13), and getting dropouts.
seems like a common problem for multicore PCs in Cubase, based on my search results. pretty disappointing to have a beefy machine and still be running into bottlenecks. anyway, no idea if thatās related to the OPās problem, but seems possible.
Can confirm. A small project from C12 with just a few tracks (at below 25% usage) goes to 100% CPU load when i add any (additional) insert to the stereo bus. Have to work in C12 until this is fixed 
Iāve also noticed the same CPU spikes and addition CPU usage in Cubase 13 when loading Cubase 12 projects. Iāve also notice my SSL UF1 lags when scrolling through tracks. Not sure whatās going on, but Cubase 12 is the better user experience, so Iām sticking with 12 until this is sorted.
DId you go to studio setup, click on control panel and change the sample to a higher number? It seems to default to 30 where I have used 512 samples before.
yes I do
Getting spikes which did not occur in 12 here too, exactly the same load/project and settings.
Also, a minor issue I guess, the mouse scroll wheel canāt adjust Send levels bars, needs clicking and dragging those instead of the behaviour in 12 where the wheel works as expected.
Oops, just tried it, and the option doesnāt effect send values in the mixing console 
Hi, Just wondering if this issue had been resolved as I seem to be struggling with the same?
I built my orchestral template recently in Cubase 12 Pro and I thought I had been using it fine (mainly to continue building it) in 13 but now itās running the CPU at 30%, the interface is laggy and thereās no audio. I tried resetting all the preferences which didnāt help, re-installing the audio drive didnāt help.
At one stage during my various re-starts, the audio came on briefly and then vanished again. Iāve opened the project in 12 and itās running fine - no lag, CPU at 9%.
Running on Windows 10, AMD Ryzen 7 5800 (I noted above someone else with a Ryzen chip).
Just a little update:
1 minor change causes a functionally-working template/project to suddenly become buggy.
Iāve verified my template did work fine in both Cubase 12 and 13. but after some changes are made (3 tracks added with Kontakt multis) and the project is saved as a template under a new name - either by Cubase 12 or 13 - it doesnāt work in 13 anymore (high CPU-use, no audio).
12 still seems solid - the files saved with 13 still open fine in that so I will stick with Cubase 12 for now until hopefully a resolution presents itself in an update in the future.
New Cubase 13 user here. Iām having the same high CPU issue on idle projects also. CPU spikes meter red for no apparent reason.