...no?

"Your code is slow" is essentially meaningless.

A normal human conversation would specify which code/tasks/etc., how long it's currently taking, how much faster it needs to be, and why. And then potentially a much longer conversation about the tradeoffs involved in making in faster. E.g. a new index on the database that will make it gigabytes larger, a lookup table that will take up a ton more memory, etc. Does the feature itself need to be changed to be less capable in order to achieve the speed requirements?

If someone told me "hey your code is slow" and walked away, I'd just laugh, I think. It's not a serious or actionable statement.