Fast way to merge 8000 raster?

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I have to merge almost 8000 rasters (TIF).

I tried using Mosaic To New Raster in ArcGIS 10.3, but it's processing really slowly and crashes quite often.

Is there a faster (or more stable) way to merge 8000 rasters?

I also have access to QGIS 2.10.1, but I'm willing to try any free software.

Thank you.



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