Change up the subtitles so you can read them better
If you're trying to make sense of what Kenny's mouthing off in South Park or have trouble following the plot points of 11.22.63, this is where captions come into play. Hulu lets you adjust them in a number of ways including the font, transparency, size, opacity, and more for better readability. You can put those bifocals back in the kitchen cabinet.
Update your Flash player. Seriously, just do it.
I always download the latest version of Adobe Flash, said no one ever. If you're trying to watch Hulu videos without any lag, quit ignoring the pop-up updates appearing on your MacBook screen. Download the latest version, but first go into your player’s settings and see which version is currently installed. You want to aim for anything 11.1 or higher. If that doesn't work, make sure your computer meets Hulu's system requirements to run 480p and 720p videos.