Gyroscopic Investing

I'm running 100% pure US PP despite being a non-US person (I'm planning to retire in 20-30 years either some cheap European location or Asia). Given the recent outperformance of the US market, I'm being tempted to switch equity portion of PP from S&P500 (VUSD) to total world (VWRD). Would you do it?

Given your background and possible future retirement locales, I'd choose an all-world allocation, yes. The risk is: the dollar is high, someday it won't be, your US stock holdings would shrink in your local currency terms.

I think that regardless of the performance of the U.S. market, you're supposed to invest in the stock portion that reflects your own country. If that is not practical, the world market is good plan. If it is practical, maybe the world market with your home market overweighted?