I see the point you're trying to make, however the increase in features (and their complexity) plus the size of the average graphic that a high-end professional has maybe grown by 300-500% since the 90s. In fact I'll tell you what: I'll give you a growth of 10,000% in file sizes and feature complexity since the since the 90s...

... computational power has grown ~%259,900 since the 90s.

The point being made is this: Photoshop does one job and has one focus should), yet it has gotten slower at doing that one job and not faster. Optimising the code AND introducing incredibly hardware to the consumer market should see Photoshop loading in milliseconds, in my opinion.