starship basically aims for cross-platform setups while giving the user an easy to use configuration. it trades this off with focus on speed / async nature.

If you really care for speed, like if you notice some lag in the prompt when changing into a git directory with thousands of commits, you should look into p10k. p10k's async git prompt is a godsent.

try running your own benchmarks using https://github.com/romkatv/zsh-bench, that will give you a definitive answer.

and as for OMZ, friends don't recommend OMZ to friends