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Or is it? Hi again, Today I finally decided to question this error that firefox has been bugging. There is no rendering glitch or run time error. Everything runs as expected but ff spams the console with this: Error: WebGL warning: drawElements: This operation requires zeroing texture data. This is slow. Error: WebGL: No further warnings will be reported for this WebGL context. (already reported 32 warnings) I narrowed it down, seems its related to creating reflection probes. (Or may be any render target cube texture). Of what I could amass from the internets is that this occurs when an "out-of-viewport" pixel is read and rendered - This question in pixi.js subforum - but I couldn't figure where and what method is accessing out-of-viewport pixels. If this is just a browser thing, can this be safely ignored? because chrome does not log these errors. https://www.babylonjs-playground.com/#KA93U#243 Thanks