The main reason ADT seems bulky and slow is because it constantly recovers in the background. This is useful when displaying compilation errors and warnings as you type, but when working on larger projects, especially when making changes to the manifest, XML files (including layouts, drawings, and lines) and resources, the IDE will regularly block the progress bar assembly, as some changes require completion of the restructuring.
You can turn off auto-build in the Project menu. I use this regularly when making changes to layouts, but turn it back on when writing code.
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