I figured I'd also mention a couple things since you are using a Laptop to play the game.

Laptops typically feature slower RPM drives, which means they spin and record data slower than typical full drives. This impacts video recording performance because, depending on the amount of data you need to write, the write speed of the drive may not be fast enough to compensate. Laptops usually come with only one HDD installed as well, meaning everything (chat programs, browsers, games, recording programs, recorded video file etc.) are talking to the same HDD at the same time, further reducing the available bandwidth you have at your disposal.

All this can lead to your video output file appearing laggy, because there simply was not enough bandwidth for all the data being written.

Even desktop PCs with a single 7200 RPM (standard spin speed for full drives) suffer from this problem because everything has to use the same hard drive at the same time. It's recommended that you record to a separate hard drive or an external hard drive so that nothing impacts your recording performance as far as your hard drive is concerned.