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Look at the Bench mark link I posted above for the CPU's. The newer 13 generation CPU's are producing better times on the Mastercam Benchmark tests as well.
Look for CPU with single thread performance, these are the ones that give the best numbers on the Benchmark test. Xeon's have never performed well in Mastercam going by past reviews.
https://www.cpubenchmark.net/singleThread.html
Just for a double check run the task manager when you have the file open and look at the performance to see that the Nvidia GPU is listed.
Failing that you might try a re-install of 2023.
Since the radius does not match the end mill radius I used a Swept 2D toolpath.
See the link to a video I created.
https://www.dropbox.com/scl/fi/su7grywgxavpgu39e8657/Swept.mp4?rlkey=wxjbc417jh5nc3n6izj5lzvco&dl=0
Assuming your radius on the end mill matches the corner radius. Chain above the radius where the radius meets the wall. Then set the depth to the bottom of the radius where it meets the floor.
If you link a Mastercam file I can make a video for you.
You should likely set the Control Definition for Inverse Time feed rates for the rotary movements. You will need to increase the min inverse feed rate in the Machine Definition as well.
Your file has it set set to degrees/min for the 4th axis rotary feed.
IMHO you will never hit that tolerance with hardened D2 over that large of an area.
Deboer isn't listing any end mills for hardened steels that I can see.
What material is it? Like @Jobnt said this is a tall task for a part of that size!!!!!!
What machine and what kind of holders are you using?
What end mill brand are you using?
Union Tool makes specific tools for machining hardened materials.
I created a video for you showing how to create a cavity from a solid model.
https://www.dropbox.com/scl/fi/hk066mbfanw9r8e3fx53a/CreateMoldCavity.mp4?rlkey=bfu7st9uro7iveufb543cvsfw&dl=0
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