Slog

Hi! I need to pick your brains.
As we know, 'wade through' connotes that to read long or something difficult without enjoyment. Is there any phrase synonymous with it?

This book is rough sledding.

rough sledding -- noun: informal A difficult time or situation. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.

I'm slogging through all this reading material.

From www.merriam-webster.com/
Main Entry: 1slog
Pronunciation: 'släg
Function: verb
Inflected Form(s): slogged; slog·ging
Etymology: origin unknown
Date: 1824
transitive senses
1 : to hit hard : BEAT
2 : to plod (one's way) perseveringly especially against difficulty
intransitive senses
1 : to plod heavily : TRAMP
2 : to work hard and steadily : PLUG
- slog·ger noun

Synonyms for 2 DRUDGE, grind, grub, ||muck, plod, slave, toil