Page load and sidemenu crashing

Hi everyone,
I realized that when clicking on any menu item, when loading the page it has a slight crash. The ion-menu-button button takes time to appear. And when it clicks, it takes time until the sidemenu appears.
When navigating between pages, every time you enter the page, this crash occurs. This html and .ts files are just a piece of the other app. Made this just for tests and even if has nothin installed, just the scaffold when create the app.

if anyone can help me to understand why its happening.