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#11
The best size of the pagefile is such that it accommodates the peak commit charge plus a comfortable safety margin. Other than that it really makes very little difference. All recommendations regarding pagefile size were designed to provide that. There is no specific size that will provide optimum performance.
The commit limit is RAM size plus pagefile size, minus a small overhead. If the commit charge hits the limit and the pagefile cannot be enlarged bad things will happen, such as application failures. Some applications can handle this gracefully, others cannot. This does not imply that the pagefile will have much usage, it just has to be that size to provide for the necessary commit limit.
The simplest way to have an adequate pagefile size is to set it to system managed. Contrary to many sources, this is not inefficient. Enlarging the pagefile does not require writing any data to the file, only updating some of the files metadata.
From a performance standpoint the pagefile should be on an SSD. Typical pagefile usage are an almost perfect match for SSD performance characteristics. For a conventional drive they could hardly be more wrong.