good size pc...8gb ram...and 1 terrabite of memory
You have 1Tb of FILE STORAGE... not memory! BIG difference.
About the file: any gradients, or transparency lens objects?
How many "undos" are set in Corel Options?
How much RAM is allocated for Corel in Options-Workspace-Memory?
What does your swap disk configuration look like?
How full is your big ol' hard drive?
Is it heavily fragmented?
Have you run ccleaner to clear out temp files?