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phetsims / build-a-molecule

"Build a Molecule" is an educational simulation in HTML5, by PhET Interactive Simulations.
GNU General Public License v3.0
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Sim is non-interactive while loading another sim in another tab. #213

Closed KatieWoe closed 3 years ago

KatieWoe commented 3 years ago

Test device Macbook Air Operating System MacOS 10.15.7 Browser Chrome 85.0.4183.121 Problem description For https://github.com/phetsims/QA/issues/550. Found while looking at https://github.com/phetsims/build-a-molecule/issues/203. I was unable to reproduce this when I tried on a few published sims and sims on master. If you open the sim in two or three tabs, and the sim seems loaded in one but not yet the others, you will be unable to interact with the loaded sim until the others are loaded. The load time for BAM is also relatively slow, so it can easily seem like a problem. Steps to reproduce

  1. Open and load the sim in one tab.
  2. When loaded, duplicate the tab once or twice.
  3. While those tabs are loading, go back to the first tab and try to use the sim.

Troubleshooting information:

!!!!! DO NOT EDIT !!!!! Name: ‪Build a Molecule‬ URL: https://phet-dev.colorado.edu/html/build-a-molecule/1.0.0-rc.3/phet/build-a-molecule_all_phet.html Version: 1.0.0-rc.3 2020-09-16 23:48:35 UTC Features missing: applicationcache, applicationcache, touch User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36 Language: en-US Window: 1347x686 Pixel Ratio: 1/1 WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium) GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 15 uniform: 1024 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 80) Max viewport: 16384x16384 OES_texture_float: true Dependencies JSON: {}
arouinfar commented 3 years ago

@Denz1994 @KatieWoe I was unable to reproduce this on my Mac, which is running the same macOS and Chrome versions as the test device. I also tried Safari 14 for comparison.

Unless there is a way to reproduce this at least somewhat reliably, I'm inclined to defer.

Denz1994 commented 3 years ago

I'm also not able to reproduce consistently. Granted I'm running a Macbook Pro, but I'd agree to defer on this. Most of the performance leg work is done during the startup of the sim. On my machine, this caused the initially loaded sim to lag a bit, but not be completely non-interactive. I had a similar experience with Density. This seems like a more general problem related to sim performance with multiple tabs.

If this becomes an issue for users, we should investigate how to reduce start-up time in this sim or address how sims perform when multiple tabs are loading. Closing this one for now.