Can a large amount of blocks in the editor make the blocks editor laggy?

[netminderno.9apps]

@ABG

• Use Media text files instead of big clumps of text blocks
• Use generic blocks instead of repeating component event blocks
• Encode repeating decision patterns into lookup tables loaded from Media csv text files (does your blocks image look like a box of combs?)

I don't know how to do the last 3 things on the list: Could you elaborate?
I am in an advanced class for CSP, and this is the curriculum we are following-
Mobile CS Principles- Register for course.
Thanks,
NetminderNo.9Apps