I usually export ggplot2 plots from R using "Save As" PDF and works fine, then I use
\includegraphics from LaTex to include the fig. The problem is that it seems that the amount of data in these exported PDF from R are big e.g. over 600K each. If I export several PDF documents like this, the end PDF is super laggy to open.
My question is: how can I change either R or load differently from LaTex so that the end document is not so big while the quality of the plots is still very high?