Hi @smalbec, welcome to the Streamlit forum!
It’s important to note that this operation effectively passes an array to JavaScript with millions of elements, since you are trying to go from 0 to 123 million in multiples of 5. It’s not surprising to me that this would make the browser have issues.
Is the user experience really important to have multiples of 5 with that large of a range? Feels like 1000 at minimum would be a reasonable step size (but of course, I don’t know your data).
Best,
Randy