Performance issue with adding large images with FlateDecode image filter

[Markovvn1]

Error details
Adding large images with the `FlateDecode' filter takes an unreasonably long time. For example, adding an 8000x8000 RGB image takes ~55 seconds.

Minimal code

from PIL import Image
from fpdf import FPDF

pdf = FPDF()
pdf.add_page()
pdf.image(Image.new("RGB", (8000, 8000)))  # this operation takes ~55 seconds

Environment

• fpdf2 version used: latest from master