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Check how delaying spinner affects duration of the Ajax request.
In the test user is perceiving two actions starting after a click. Both of them have the same duration (0.2s, 0.4s, 0.6s, 1.0s or 1.5s). Spinner is delayed by a random time chosen from the set of (0.2s, 0.4s, 0.6s) and is seen only if delay is shorter than the action duration.
User has to choose which action performed faster and if any action felt unresponsive. The fact that the actions took the same time is unknown to the user.
Please contact @zalun if you'd like to discuss methodology or results