My system is using all the memory when playing a larger WebM video.
When all memory is in use, the video stutters.
This happens in Nw.js version v0.31.0 (Chromium 67) and version v0.30.0 (Chromium 66)
When exporting to NW.js version v0.29.0 there is no memory leak and the WebM video plays ok.
Yep, I can confirm this.
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Please file a bug report following all the guidelines if you want this looked in to.