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Defer blocking WebGLPrograms queries after linking (mrdoob#19745)
Program linking can happen asynchronously, but is forced to block and wait for completion the first time information about that program is queried after linking. This includes calls to getAttribLocation/getUniformLocation/getUniform/getProgramParameter/getProgramLogInfo, etc. This change defers most of those calls until the first time until the first time that they're actually needed by the page, which can allow the program linker time to complete and thus reduce blocking, especially when used in conjuntion with renderer.compile(). It's worth noting that many materials are initialized the first time they are encountered by the render loop and then immediately used for rendering, which negates most of the benefit that this could otherwise provide, but it lays the groundwork for more efficient patterns in the future and can significantly help classes like PMREMGenerator that are already using renderer.compile() internally.
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