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Expected Behavior

When I use a Select Field, it should "feel" responsive and fast. Currently, before the menu with all select options pops up, we wait until the mouseclick is over. Instead, at least on non-touch devices we should consider starting the opening animation as soon as the click starts (for instance the mousedown event).

Current Behavior

As described in "Expected Behavior", currently we wait until the click event is over before the Select field opens the menu with all options. This makes it feel much less responsive and slow compared with say the native select field in Chrome, which opens instantly.

Steps to Reproduce

Check the Select page in the current documentation to try it out: https://material-ui.com/demos/selects/

Context

We use the select field in various places of our app, and we feel like the current behavior of the Select field makes our application feel sluggish and slow.

Your Environment