Everyone is different, but I play 4 tables NL full ring and rarely feel bored, although I think I may be ready to step up to 5 tables once I get my new monitor because I've gotten rather proficient with 4 I think. I also don't feel like I nut peddle. I try to get reads and play premium hands and trash if the situation calls for it. If I was just clicking buttons nut peddling, then yes, 4 tables would get boring quickly and I could probably play 10 to 12 tables, but as I've advocated many times in many threads, paying attention, taking notes, getting reads, and playing real poker is ESSENTIAL. I think my stats are 24/18, which I would classify as semi-tight although some may consider it semi-laggy or laggy.