(Link to video)
This is an SMB2J any% run with most optimized stages and latest techniques, and a 27-frame improvement over my last run in 2011.
I didn't expect my last run could be improved, until a week ago, I found a faster way of falling in the water after hitting a ceiling, which saves 1 frame from the water stage in 8-4. The key is to maximize the falling speed by just the right swimming strength.
By then I thought: "Oh, great, another 1-frame improvement. How would I dare to submit it this time..." But when I started testing some previous stages, it shocked me that I could pass the wall by bouncing on a Goomba without losing speed after all, saving a frame rule (21 frames) in 1-2, something I thought was impossible 5 years ago. The key is to manipulate the loading time of the two Goombas, and to jump very precisely.
Both stages have been improved during the last run. I'm surprised that they can be improved even further.
The other 5 frames come from the first stage of 8-4. They were lost due to bad luck at the Podoboo in the last run, but are now back.
With every stage fully optimized, I boldly predict that this would be the speed limit and the very last any% run of SMB2J, along with SMB warped run.

Special features

Every stage has been reproduced and perfected, except 1-1. There are also a few surprises in store where time hasn't been saved, for instance:
  • Lakitu's kiss at the end of 4-1
    • I guess it's more interesting if you imagine it as a "kiss", rather than killing Lakitu the same frame it turns around.
  • Jumping through the long firebar in 4-4
    • Back when I was making the SMB2J Luigi TAS, I thought time wouldn't allow Mario to jump through the long firebar at the beginning of 4-4, but it turns out that it does, just barely for Mario to catch up with the frame rule.
  • Sliding at Warp Zone of 5-2
    • It's only possible thanks to the fast pipe entering trick I found during the Luigi TAS.
  • Killing final Bowser
    • Watching such quick kill, can you see how many fireballs are used?
Overall, the entertainment is improved a lot, with more actions, more killings, more music playing, etc.. I can't go through every minor improvements and detail, so here's a self-explanatory comparison video that I made: Download 2048x1152 HD comparison encode (MKV, 35.3 MB)

Suggested screenshot

This time, I changed the location getting the Fire Flower to a much dangerous place, which no TAS has ever set foot on. Although it only doesn't waste time because of the frame rule, I find it more entertaining, because getting the flower earlier helps to clear some enemies on the way, and the movement itself is pretty extreme and even more difficult than it seems.
Thank you for watching. I hope you'll enjoy the new run even better. :D

Masterjun: Oh man, saving the frames! Judging.
Masterjun: Solid optimization, and cool idea to use the frame rules as an opportunity to entertain a bit more! Accepting to Moons as an improvement to the previous run.
Spikestuff: Publishing, and encoding 13 times over Nevermind. Famtasia Screwed me.

TASVideoAgent
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This topic is for the purpose of discussing #5394: HappyLee's FDS Super Mario Bros. 2 in 08:04.83
Spikestuff
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I love everything about you this. Yes. Yes. (Claiming when Accepted)
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dhxo
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Just in time, as you said. I love how you bring games to their limit, especially movies that are considered unbeatable for six years which you just crush into peaces. Great entertainment value, great perfection, very precise. I also like all the ghost-runnig you did. Easiest Yes-vote I made.
You are reading this.
BigBoct
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Loved it! Easy yes vote.
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Highly entertaining and an incredible technical display. What more can you ask for? Yes vote.
Judge, Skilled player (1274)
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This TAS is insanely good, about both techinical and entertaining value.
my personal page - my YouTube channel - my GitHub - my Discord: thunderaxe31 <Masterjun> if you look at the "NES" in a weird angle, it actually clearly says "GBA"
Amaraticando
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Nice job, HappyLee! Yes vote of course.
Patashu
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Yes vote! Really loved the musical playarounds.
My Chiptune music, made in Famitracker: http://soundcloud.com/patashu My twitch. I stream mostly shmups & rhythm games http://twitch.tv/patashu My youtube, again shmups and rhythm games and misc stuff: http://youtube.com/user/patashu
Arcree2
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Amazing TAS, Yes Vote !
Projects: Genesis Crack Down 1 Player - Work In Progress
Challenger
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Great TAS, HappyLee! After 5 years, another improvement of this game! Yes vote. After this, what will your next TAS, someday?
My homepage --Currently not much motived for TASing as before...-- But I'm still working.
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Thanks for asking. You'll see my next TAS in about three months, hopefully. I've been working very hard on that project and I hope things continue to go as planned. :)
Recent projects: SMB warpless TAS (2018), SMB warpless walkathon (2019), SMB something never done before (2019), Extra Mario Bros. (best ending) (2020).
fcxiaopengyou
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that's cool, easy to vote yes and expect your next tas :)
Working on: [NES] Downtown Special - Kunio-kun no Jidaigeki Dayo Zenin Shuugou! (J) ''2 players 100%'' Plan: [SNES] Kenyuu Densetsu Yaiba (Japan) _________________ My English is pour. 
Challenger
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HappyLee wrote:
Thanks for asking. You'll see my next TAS in about three months, hopefully. I've been working very hard on that project and I hope things continue to go as planned. :)
Super Mario Bros. or Extra Mario Bros? And speaking of Extra Mario Bros, I think it's possible to get to the final boss by getting 5 keys instead of 8 keys. I can't remember correctly, because it's been a few years (2012, I think) since I last played that game.
My homepage --Currently not much motived for TASing as before...-- But I'm still working.
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Challenger wrote:
Super Mario Bros. or Extra Mario Bros?
Neither. But it won't be a big surprise, I guess. You'll see.
Challenger wrote:
And speaking of Extra Mario Bros, I think it's possible to get to the final boss by getting 5 keys instead of 8 keys. I can't remember correctly, because it's been a few years (2012, I think) since I last played that game.
It's not possible to fight the real final boss (huge Bowser) if Mario only collects 5 to 7 keys. It will only lead you to a different version of Area 5, and you'll be sent back to collect the rest of the keys, so it doesn't count as beating the game.
Recent projects: SMB warpless TAS (2018), SMB warpless walkathon (2019), SMB something never done before (2019), Extra Mario Bros. (best ending) (2020).
Warepire
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Well done on the improvements, and the added entertainment was great. Voted yes.
Lex
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I love the parts in which you swim and jump right into the fire spinners.
Editor, Emulator Coder, Expert player (2100)
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I like this more than I like the SMB one. IMO this is a better game, which allows for better TASes. Yes vote.
<klmz> it reminds me of that people used to keep quoting adelikat's IRC statements in the old good days <adelikat> no doubt <adelikat> klmz, they still do
WST
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An easy yes vote, looks so much tool-assisted, love it
S3&A [Amy amy%] improvement (with Evil_3D & kaan55) — currently in SPZ2 my TAS channel · If I ever come into your dream, I’ll be riding an eggship :)
Active player (372)
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Never saw the original, this was amazing. I especially liked the timing to the music. That never gets old!
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B O I O I
Current: Rayman 3 maybe? idk xD Paused: N64 Rayman 2 (with Funnyhair) GBA SMA 4 : E Reader (With TehSeven) TASVideos is like a quicksand, you get in, but you cannot quit the sand
Pike
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Always incredible.
Luck manipulation is too difficult.
Post subject: Re: #5394: HappyLee's FDS Super Mario Bros. 2 in 08:04.83
Joined: 5/17/2007
Posts: 393
Location: Sweden
TASVideoAgent wrote:
With every stage fully optimized, I boldly predict that this would be the speed limit and the very last any% run of SMB2J, along with SMB warped run.
Well, that is what I thought about the run before this, and before that :P Grtz on another insane improvement
"No love for the game gear"
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Beautiful entertainment! Obvious Yes vote, this is a contender for NES TAS of the year.
Expert player (2448)
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Not to blame anyone for anything, but this has been "publication underway" for over half a month. I hope it's not forgotten and nothing has gone wrong. Is there anything I can do to help, Spikestuff?
Recent projects: SMB warpless TAS (2018), SMB warpless walkathon (2019), SMB something never done before (2019), Extra Mario Bros. (best ending) (2020).
Post subject: You did say "anything" after all.
Spikestuff
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HappyLee wrote:
Is there anything I can do to help, Spikestuff?
Can you get Famtasia running FDS?
WebNations/Sabih wrote:
+fsvgm777 never censoring anything.
Disables Comments and Ratings for the YouTube account. These colours are pretty neato, and also these.