Classifier: Long delays (up to 10s) after pressing Done

[eatyourgreens]

Volunteers on Daily Minor Planet are reporting delays of up to 10s after pressing the Done button.
https://www.zooniverse.org/talk/17/3531984?comment=5898899

The delay seems to be in submitClassification here, which waits for the classification to save before showing you a new subject. It would be faster if it behaved like PFE and saved the classification in the background, while you classify the next subject.

front-end-monorepo/packages/lib-classifier/src/store/ClassificationStore.js

Lines 174 to 183 in 9c6bfa8

	function * submitClassification (classification) {
	// Service worker isn't working right now, so let's use the fallback queue for all browsers
	try {
	yield self.classificationQueue.add(classification)
	self.loadingState = asyncStates.posting
	} catch (error) {
	console.error(error)
	self.loadingState = asyncStates.error
	}
	}

Here, I've captured a couple of classifications, in the console, which took ~5s and ~4s respectively.

[eatyourgreens]

One caveat: if you press Done & Talk, then you do want the classifier to pause until the classification is saved. Otherwise, the browser tab will cancel the network request (and any running JS) when the page unloads (#4767.)

[eatyourgreens]

Here's a link to the full discussion on DMP Talk. This problem has been going on for at least a few weeks now.
https://www.zooniverse.org/projects/fulsdavid/the-daily-minor-planet/talk/5639/3570312

[eatyourgreens]

Delays of 4s to 10s for each classification mean the FEM frontend is, unfortunately, almost impossible to use at the moment.