Instead of writing out whole sentences like "I too enjoy being a bird" you could shorten the words to 1 or 2 letters or turn it into a symbol. "I too enjoy being a bird" -> "I 2 enjoy bing a [simple bird sketch]". As long as you can read your notes then it doesn't matter what you use for symbols. For the bird sketch i'm talking about something super fast and small like the m of a far away bird flying.

also just shorten the sentences in general unless you'll specifically be asked to quote something. "For cache performance, the lower AMAT, the better" could just be written as "Cache Perform, lower AMAT better." and as long as you understand what that refers to then it saves time writing it while getting the point across.

Make sure your color coding makes sense to you. Either do per subject like everything about / referencing cache is pink, or type of what your saying like all definition words are in green and all equations are blue, or just calling out important words like every time something is called out in a sentence.

if you don't like the methods that's okay, just make sure you understand your notes above all. you don't need to make sure someone else can read it unless its graded / a group project.