I am using QGIS 2.12.0- Lyon (64-bit) at work and have been finding with especially large amounts of data (many vector layers) that all processes on the system have been running slower. I am running on a Windows 7 machine, 64-bit system, with 4GB RAM and an Intel(R) Core i5 processor, at 3.20GHz. I was wondering if increasing the RAM would make a difference to the speed of loading and manipulating my map on QGIS? Is it worth increasing?
I had also heard that ArcGIS versions before 10 were not able to use multi-core processing, and wondered if this may be the case for QGIS also, therefore there is no need to upgrade processors?