Versions from 1.13-1.15.2 have much lower preformance than 1.12.2

Just a side-note; when doing comparisons/tests like this, make sure to turn off the biome blend option in the video settings. This feature is new to 1.13+ and might or might not have a great impact on performance.

Ok ill redo the tests.

As i did the test again with biomeblend off there was no observable difference. I updated the new 1.15.2 asset.

We will need some more information to diagnose the performance issues. In game, please do the following:

while the lag is occurring, run:
/debug start
wait a bit of time
/debug stop

Also, run:
/debug report

After which, attach the result files found in your /debug folder inside the .minecraft directory to this report. Unfortunately, these commands were only introduced after 1.13, but the reports will assist in diagnosing your issue.

I do want to point out though that "My FPS and TPS are lower" isn't sufficient to be a helpful bug report. It is no secret that over time, as more features have been added to the game, that there have been performance degradation. There have been similar reports in the past for bad performance, but as of 1.15 the developers have requested that reports identify specific causes for performance issues (e.g. "Lots of entities in a small space"). Furthermore, if multiple causes are identified, we would want to keep these in separate reports for better tracking.
Examples of such reports include: MC-147548, MC-164123, MC-166005, MC-123584

Ok so i re conducted the first test and i added both the debug profiles and dumps to the files part of the report. 😉 But the difference between the 2 versions is too big to be a result of "more features" so ill reopen the issue.

The 1.12.2 debug profile only contains the report and not the .zip dump.

As it stands right now, this ticket is not a valid bug report. "My performance is worse than in previous version" is not really helpful to us or Mojang. If you manage to find out what might cause worse performance though, please feel free to create a new ticket (for every single cause). Also if possible include test setups that can be used to test the issue you are encountering.

Additionally, it is important to note that server-side performance (i.e. chunk loading) and client-side performance (i.e. fps) are very separate things and cannot just be put into the same ticket.

Also note that some performance issues already have existing tickets (such as MC-164123 about the changed FPS/chunk loading priorization). You can leave a vote and a comment on those instead of creating a new ticket if you encounter the exact same issue.

In its current state, this ticket is just too broad in order to be useful and thus I will close it.

@unknown, please keep in mind that every comment and change you submit to the report sends out a notification email. It is strongly recommended that you do all of your changes at once, instead of making multiple changes and applying them.

The same thing is happening on Bedrock, except it has started at 1.14!