Window with a CTkScrollableFrame lags when resizing

**Description**
When a window containing a CTkScrollableFrame is resized, the entire UI lags.

**Steps To Reproduce**
1. Create a window, either tkinter.Tk() or customtkinter.CTk()
2. pack a CTkScrollableFrame into the window
3. resize the window

**Additional context**
This bug is observed to happen all the time on Linux, but much worse only sometimes on Windows. I haven't tested it on macOS.