Android Studio debugger taking too long to start/load

Its probably because you have introduced C++ native libraries in your App, to only debug java, click Run > Edit Configurations and then in the debugger tab, change Debug Type to Java

According to docs:

Because different debugger tools are required to debug Java/Kotlin code and C/C++ code, the Android Studio debugger allows you to select which debugger type to use. By default, Android Studio decides which debugger to use based on which languages it detects in your project (with the Auto debugger type)

The debug types available include the following:

Auto

automatically choose the best option for the code you are debugging. For example, if you have any C or C++ code in your project, Android Studio automatically uses the Dual debug type. Otherwise, Android Studio uses the Java debug type.

Java

Select this debug type if you want to debug only code written in Java or Kotlin—the Java debugger ignores any breakpoints or watches you set in your native code.

Native (available only with C/C++ code)

Select this debug type if you want to use only LLDB to debug your code. When using this debug type, the Java debugger session view is not available. By default, LLDB inspects only your native code and ignores breakpoints in your Java code. If you want to also debug your Java code, you should switch to either the Auto or Dual debug type.Select this debug type if you want Android Studio to

run app first, then press the "attach debugger to android process" button, it will open a choose process dialog, set the debugger from 'auto' to 'java'.