32px tiles for 64px tilemap

I would like to try to use 32px tiles images for the tilemap with 64px sized tiles, so Phaser stretches every 32px image/tile up to 64px size. For performance reasons, I wish to test whether it helps. Is that possible?

The expected result is the same size map, but with a little lower quality because of the images resolution. I’ve tried some scene configurations, but no luck - map looks broken or all tiles are 32px small.

If that’s not possible - what are the maximal recommended WxH tiles total count on the map & visible screen area?