Extremely slow spectral adjustments

I fine-tune audio podcasts in Adobe Audition. Sometimes the podcasts are an hour or longer. When I'm zoomed in and need to cut something, do a simple volume adjustment, or add a fade to a selection, it always takes way too long to complete. We're talking sometimes 20-30 seconds or more per edit. Auto-healing isn't too bad, thank god! However, any function that requires a screen-wide redrawing of the spectral display takes a ridiculous amount of time. To the point where sometimes I just go watch a quick YouTube video after every single edit. LOL. I have a very fast computer with very fast internet speeds, so that shouldn't be the source of the issue. I just think Audition isn't programmed to handle large files. I suppose the only way to solve this is to chop up the hour podcast into four separate 15 minute files. I can do that if absolutely necessary, but I thought I ask why Audition is so sluggish and if anything can done to improve performance in upcoming versions. Perhaps Audition shouldn't try and load things each and every time that are 20 minutes or more down the line. The programmers should treat it like a video game where new locations aren't drawn until you actually reach them to explore. "But what about playback?" Well, then have a mode change from fine editing to quick listening.