vg/vgpdf: multiple canvas unecessarily rebuild same fonts
sbinet opened this issue · comments
while running a monitoring program that analyzes about 6G of data and produces plots, I noticed half the real time was stemming from producing ~100 plots (PDF).
digging a bit, I noticed a few suboptimal behaviour on the gofpdf
side:
but also a bigger part coming from vg/vgpdf
that recreates the pdf fonts (makeFont
) over and over: one per vgpdf.Canvas
.
we probably need to create a per-package cache that the vgpdf.Canvas.fonts
cache would build upon.