# Runtime Performance
The runtime performance of Weixin Mini Program directly determines the user's experience with Mini Programs.If there is a problem with runtime performance, it is easy to have page scrolling cards, response delays, etc., affecting user usage. If memory usage is too high, problems such as black screens and flashbacks will also occur.
Before optimizing runtime performance, developers are advised to understand the runtime environment and the operating mechanism of Weixin Mini Program.
Developers can begin to optimize startup performance in the following areas: