There are many aspects to "performance".
Most horsepower?
Best fuel economy?
Best wear results on oil analysis sampling?
Lowest lube oil cost per mile of operation?
Least engine mechanical noise?
Least oil consumption?
Best exhaust catalyst life?
Ability to crank at extreme low temperatures?
Some of these require trade-offs vs. others.
So you first have to identify what is of importance for your application.
Then it's possible the smart folks here could give you some direction.
While rethinking about it and after reading your interesting post I'll say that paying a premium for an oil if used in normal services is a waste of money but help some to have a better sleep
More horsepower? Mostly unnoticeable
Best fuel economy? Mostly unnoticeable
Best wear results on oil analysis sampling? Marginal importance, placebo effect played the biggest role
Lowest lube oil cost per mile of operation? Not negligeable
Least engine mechanical noise? Placebo effect
Least oil consumption? Measurable and can be important and or negligeable
Best exhaust catalyst life? That can help , but misfiring can ruin all the gain in a very short period of time
Ability to crank at extreme low temperatures? Somewhat important
So my conclusion, buy a certified oil from a reputable company and invest the rest of the money in the S&P 500