Cells are tiny and the speed of sound is how fast air molecules move. Proteins are also not bouncing around as fast but it’s very still quick relative to their size. Next, often there are multiple copies of each component. That’s half the story, larger cells also have various means to clump things together to improve the odds.
https://en.wikipedia.org/wiki/Endoplasmic_reticulumPS: Speed of sound is 343 m/s, diameter of a cell nucleus is ~ 0.000006m to give an idea.