No, plus your asking in the wrong thread. The build you are hoping will miraculously get leaked, is only available for testing internally somewhere inside MS for the moment being. Also the iso download link wouldn't be allowed to be posted on this forum, as there's no way to verify the hash to check if it's a genuine iso from MS.
Yep. Decided to test for myself. 23H2 feels slightly more sluggish and less stable than 24H2 on the same hardware. UI animations will sometimes stutter... While 24H2 with all latest updates feels slightly snappier overall. Ironic. As it usually is the other way around (older software should perform better than newer software... theoretically.)
Initially 24H2 was actually more sluggish. Things improved a lot over time both through Windows Updates and especially GPU drivers updates.