Probably depends on size of images in pixels, and specific number of images. In general I wouldn't want images larger than about 250k for decent sized photos (800 x 600 or larger).
There can be all sorts of exceptions, but a key consideration is what's the likely bandwidth of your user's connection? Several times I've run into image intensive websites that "look cool" but I never get far, or stay with them long, because it takes so long for their web pages to load.
I'm creating an image slideshow first with Superflex and the first image I've edited has dimensions 1000x378 and only 175kb so I seem to be at a suitable size then?
Size seems to be fine. Dimensions may be a bit large (the 1,000 pixel width) but as long as it works well with your theme then it all sounds fine.
I should add that the number of images may make a difference. Having 10 images at 200k (or thereabouts) is very different from 100 or 1,000 images at 200k.
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There can be all sorts of exceptions, but a key consideration is what's the likely bandwidth of your user's connection? Several times I've run into image intensive websites that "look cool" but I never get far, or stay with them long, because it takes so long for their web pages to load.
I should add that the number of images may make a difference. Having 10 images at 200k (or thereabouts) is very different from 100 or 1,000 images at 200k.