note about perf

Author: cometkim

text/0001-int.md

@@ -200,7 +200,7 @@ The `number | 0` is the most concise output form we can consistently use. Introd
 
 Perhaps, we can make our number literals match JavaScript's number semantics. We could also rename `int` to `int32` and assign another literal like `0l`, as it was in OCaml syntax.
 
-However, this is not something that will happen in the near future. It won't occur until we are confident in our migration strategy to avoid breaking existing codebases. If done incorrectly, it could completely break compatibility with existing code.
+However, this will not happen in the near future. It won't occur until we are confident in our migration strategy to avoid breaking existing codebases. If done incorrectly, it could completely break compatibility with existing code or cause significant performance degradation.
 
 ## Future posibilities