I have been investing in the TSP since November 2007. Going into my federal career I researched a lot of financial planning. Time and time again almost everyone said that it's important to have at least some of your account invested in international stocks. Well, fast forward 17 years, and about 10-15% of my account has been underperforming in the I-Fund. It's taken me a long time to get to the point of considering cutting them out (mainly because of this year's 20% difference between C and I) and just putting that money in the C-Fund. Is international ever going to catch up on an annual basis to the huge outperformance of the C or S funds?