I would upload all statements, yes.
USCIS needs to see you use your bank accounts and share finances through the years, on daily basis.
The amount of evidence has nothing to do with processing times. Most of the times the case sits in the queue and waits for its turn. Then officer opens file, spends 10-20 minutes on it and decides the case. He doesn't read each line of each statement, unless there's something suspicious about the case or evidence. The way evidence is used - officer takes a quick sample (random statement or two) from everything uploaded and ensures it's good.
Don't forget, everybody naturalizing has to go to interview. This is where most of time on case is spent, probably 30-40 minutes per person on average.
About 30000 people filed for N-400 in December 2024 alone. Multiply it by 30 (optimistic estimate). This equals to 900 000 minutes on interviews alone, or 15000 hours... And every month there are new filers.