PDF size increased between v0.6 and v0.8

[fgelm01]

The size of the generated PDF for the same input increased between version 0.6 and 0.8. With 0.6, the pdf size was 12MB. With 0.8, it is 19MB.

I also noticed that some fonts look different now.

v0.6:

v0.8:

[fgelm01]

Update: Looks like the font difference is a consequence of weight being interpreted differently. A value of 550 was enough for 0.6 to produce bold for this font, but now anything below 700 produces non-bold.

[spirali]

Can you please share your presentation (at least privately)?
My internal benchmark shows that the new version produce slightly smaller slides then previous versions (and much smaller slides if you heavily reuse raster images on slides).

I will investigate what have changed in font rendering wrt. font weight

[fgelm01]

Hello. After a long time, I have an update for you.

Nelsie Version	PDF Size	Generation Time	PDF
0.6.0	12MB	5.14s	v060pdf
0.7.0	23MB	5.35s	v070.pdf
0.8.0	22MB	8.32s	v080.pdf
0.11.0	17MB	26.44s	v0110.pdf

All documents were generated from identical Python input. The only variable was the venv with different versions of nelsie installed.

[spirali]

Thank you for your update. Can you please share the source code with me? I would like to profile it, increase to 26s is really unexpected.

[fgelm01]

I have emailed you the source for my presentation. Please let me know if you got it.

[spirali]

I have not received your email.

[fgelm01]

How can I privately share the source code for my presentation with you?

[spirali]

I have found your email, I am sorry.

I can confirm the performance regression (in my case v0.11 is 2x slower then v0.7). I will try to investigate the problem. Thank you for your slides!

[spirali]

I did some profiling and measurements and it seems that there are some regressions in text rendering and text size computing. Your slides are also quite heavily using text_anchors that needs some extra text computing so it amplifies the effect.

I am going to implement some optimizations around text rendering so I hope it helps. I cannot revert to the previous text processing as API of upstream crates were changed.

The increased size of slides is still quite mystery for me, and I still do not have final conclusion.

[spirali]

FYI: I have integrate new upstream crates that fixes a problem with subsetting. In "main" branch (unrelased yet), it decrease the size of PDF to 6.8MB and it is about 15% faster. I will make new release in few days.

Btw: So far, I did not find a definite way to solve rendering speed with the current renderer but I am experimenting with Parley and it seems as a way.