DICE is letting players get more involved with improving Battlefield 4, with an opt-in Community Test Environment. The CTE will give the studio a test bed to try new ideas and solutions to current issues, and it DICE already has plans for the first test.
Netcode will be the first test, and the CTE will be the guinea pigs for minor tweaks to the networking code for optimization. Spots are limited and you need to be a Battlefield 4 Premium member, according to the announcement, and you'll need to download a separate PC client and play on that version when you want to be a part of the test. DICE isn't offering any kind of special incentives for doing this, so helping will have to be its on reward. You can find sign-up instructions and guidelines at the official site.