The Wolfram Language gives you the ability to fine-tune the level of detail for your plots. To get a rough sketch of a plot, you can tell the Wolfram Language to plot fewer points. The more points you have in a plot, the more detailed the results will be.
First, plot a simple function:
Set the option Mesh->All to see the default sample points that the Wolfram Languageuses:
You can adjust the number of sample points plotted with PlotPoints. MaxRecursion controls how many recursive subdivisions can be made: