How can I perform a Join by Location for a large vector and very large point file?

Published: 5/10/2017
How can I perform a Join by Location for a large vector and very large point file?
Source: GIS.STACKEXCHANGE.COM

I have no programming skills, but am thinking I may need to at least figure out how to run this one script from inside QGIS. I have a vector file of global quarter degree grid cells and a point file containing an incredibly large number of points with population values. I want to create a polygon file that has the sum of the population values (not just the count of the points) for each grid cell.

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