Compared to 1.14.4 the newest snapshots perform very, very poor on my system. Framerate is zero most of the time (sometimes little bursts happen for a short time).
Test: I created new worlds (both seed: TEST) in 1.14.4 and 19w42a respectively. Then waited some time for world creation, before creating debug profiles/reports and making screenshots.
Result: While 1.14.4 after some lagging is playable (though not enjoyable, 'cause still too laggy), the 19w42a snapshot is a slow dia show and not playable at all.
Attachments
Comments 2
In the meanwhile I changed the grafic card, which solved the problem. The tests described above were made with the on board Intel HD 4900 of my notebook. After assigning the NVidia GPU to Java, the game run smoothly (at least after world was finally loaded).
So it seems that the snapshots just have a problem with the (weak) Intel card. It was enough in the past, but not any more.
Please check if that's still an issue for you in 19w45a.