So: -increase threshold -lower samples -activate denoise -double up resolution

This stuff should be explained right at the checkbox.

With adaptive sampling, the amount of Render Samples and Noise Threshold don't work 'hand in hand', but it's more a situation of "whatever happens first. If you set your Noise Threshold to 1.0, you can set Render Samples to 20.000. The idea is that once the threshold is reached, Blender will stop sampling for that pixel anyway. Likewise, you can set max samples to 128 and Noise Threshold to 0.001 and Blender will stop sampling after 128 samples. The point of these two settings is to allow Blender more time to clear up demanding areas of the scene, while not oversampling simpler areas that might already look clean using few samples. The game-like graphics in the video here might tolerate noise reduction better than a photorealistic scene would.

I also noticed similar things, and I think the reason for that is the denoiser - it sometimes gets rid of details, and sometimes causes artifacts. By bumping up the resolution you give it more input to discern the details.

I don't even know what emotions I'm feeling right now....Thank you.

I had to leave a comment for you David, because I tried your method on my blender file and my jaw dropped after seeing how much faster files render. Plus I can up the resolution and still get much faster render times than the original lower-resolution images. This is a brilliant find. Thank you for not keeping it to yourself and taking the time to share your findings.

As a blender newbie just trying to take in as much info as I can this is one of the most helpful videos I've come across so far!! Just wanted to say thank you for sharing

I discovered this two decades ago in LightWave! The noise reduction is a God send and one of the things you can also do is switch off caustics and reduce the number of light bounces from the ridiculous 1024 to say 7, 3 would do!

Wow, this is amazing!!! Nearly can't belief the improvement. Many thanks.

Omg dude, my individual PNGs with transparent backgrounds were going to be 16 minutes each frame. They are now about 10 seconds at 4K and they look really good. Thank you!!!

Man I gotta get back to Blending. Your tip reminds me of the quirky settings in Stable Diffusion (making acceptable compromises for average GPUs). Kudos for finding this workaround. Lower render times are a game changer!

Holy crap! That's the best bit of Blender knowledge I've seen dropped in years! Just tried it on a fairly complicated scene which was taking nearly 55 minutes to render (i9 64GB RAM, 3090 GPU). It took 1 minute 54 seconds. No discernable difference in quality.

Another setting to play with to lower render times is the light paths option, by default its light bounces are setup as: Total 12 Diffuse 4 Glossy 4 Transmission 12 Volume 0 Transparent 8 But, if you have no complex materials in the scene such as see-through glass etc, you can remove those bounces. There are articles to explain better because I barely understand the values. A word of warning, if you're using the principled hair BSDF it won't display right if you change these values, instead appearing far too dark.

You just saved me so much time on a project I need to output 600 images. Amazing. You are the man.

Thank you for the tip! Can't wait to check it out

Yes. I had to fiddle a lot with it and couldn't figure out what happens and drove me crazy. The reason why it is way better at low samples is because the denoisers were trained on samples that has adaptive sampling turned off. When you enable it, the denoiser cannot find the same patterns. These errors are multiplied as the sample numbers are increasing.

i keep coming back to diese video, it's great settings! thank you for making it

Wow, that's a great tip! My 3D PC is old and slow, and I mostly render things for previews. This will improve it a lot :)

This really worked for me! I rendered it without this method and it took at least 2 minutes but with the method, the samples stopped at 32 with a 100 max sample and it rendered out awesome. Thanks for the assist 👍😁

This is good information for if I ever get into blender. One of my major reasons to not getting into it (other than sucking at animation) is the extreme render times. But since I never plan on making animations this detailed, it'd probably be worth for me spending some time in it for ultra fast rendering.

Thanks for the video, it definitely helped with a project I'm working on. I did some testing, and this synergizes with Min Light Bounces and the denoiser in the compositor. It adds a bit of time (in my scene, 29 to 33 seconds, down from a 3 minute full render), but the quality is dramatically better. You don't need to go any higher than 5 on the min light bounces, and the denoiser should be set to accurate.

Thank you so much brother, i thought i would never be able to render a proper 2 minute scene on my pc, but now i know i can!

Looks amazing!!! And also thanks fro the tip.

Nice tip here, thanks, and another thing you can do to improve your render speed and I saw a lot of people doing it wrong is that if you have a good RTX GPU, you need to disable CPU in Optix section in system settings. People think that combining the power of both CPU and GPU will make render faster but this is not the case and this is totally wrong at this point if you have a RTX card like 3080 or even better 4080 or 4090. The theory behind this is that RTX cards have a feature called RTX acceleration which is specialized for raytracing and you need scene data to be stored in VRAM to make that happen. If you check both CPU and GPU in Optix section, then CPU comes in play and it requires data in RAM which prevents GPU to access data directly in VRAM then the GPU will not fully be utilized and RTX acceleration will be disabled on hardware level. I have a ryzen 3950x and a RTX 4090, by unchecking CPU in Optix scetion, I gain 2x to 3x speed improvement on average. This is one simple button click magic and many people just don't do that, if you haven't, you can try it.

Brother you saved me 😢 because when ever I tried to render a heavy project either my Laptop dies or my blenders goes to heaven but now it's working fine and quick 😮

Yo, your render and project look amazing ! Here would be an advice about the composition for the "colors/lighting" that you DONT HAVE TO take, it's just something that i thought of... I think it would look even better if it was more bright. what i mean is that the image is really really dark and it would probably be insane with puddles to equilibrate the lighting between the top and bottom of the image... Anywars, great works, it looks insanely good

Low noise threshold give better quality with less noise but it also create stripe of different noise level. Then the denoiser can interpret these as important detail and keep them and it makes the image worse. So when you go to 0.5 threshold there is more noise but it is even and the denoiser work better in these condition. Also the min samples... If you leave it to 0 then it automatically render a lot of sample before starting to test for the noise level. So it can waste time on part of the image that are already OK. So it is not a bad idea to test with a low number to see if the quality is good enough. This can sometime cut render time even more.

Thank for sharing ! this will save me so much waiting !

Man you just save me a lot of time in a project I was working in!!!

Thank you. This is very applicable to my current project.

Thanks a lot - this is just what i needed!

you're my hero! love this!

Damn, thank you... I was struggling with render time with an animation just like you. I was going to render it like in 3 hours. But now i am able to do so with higher res but 1 hour

THANKS! This actually works!!!! I have a store with shelves full of hundreds of items. What took forever to render is now 75% faster to render.

This method worked very well for me, thank you.

noise treshold is only used for optimization, it just disables render on certain part of image that noise level lower than treshold. you can disable noise treshold if you render equally noisy at any part, and set something about 250 samples. noise treshold evaluation is consuming some computational powers itself. Sometimes 64 samples is cleaner than 1024 with high noise treshold with same time. and use fast denoiser also if you want maximum render speed.

Thank you for sharing this!

I love hese kind of tweaks I did not know about this. simply use the densoise check and set up the rest in the compositor to compress my render time enormous.

THank you so much, it saved me from a lot of headache

Great idea, I'll try it

my render time for a car model went from 7 mintues to just 23 seconds. That was really helpful.

I can't belive my eyes!! THIS IS AMAZING, THANK YOU SO MUCH! 😭😭

This is incredible! Thanks for sharing

Great, hoping making a complete tutorials ou workshops in the future

There are many options on how to optimise the scene. You did it nicely. Also consider temporal denoise feature included in blender. It makes animation even better by removing denoise flicker. there is turbo tools addon. That makes rendering even better and faster worth the money and time.

this changes EVERYTHING

I have an avarege configuration and this detail was really very helpful... Great thanks👍

Holy, you're a damn lifesaver. Cut down my rendering time on my 30 second WIP animation from 18 hours to 14 minutes. Goddamn. Thank you.

Thanks for the tutorial !

In my case I never adjusted the "min samples" values, always used the 0 value. And now I did a test and configuring the min samples to 8, this speeded my render a lot. (30%)

This is very useful, thank you

This saved me so much time! thank god for you man

No way man, thanks for sharing this trick!!

Großartiges Video, ich wollte immer Animationen rendern doch es hat immer ewig gedauert. Bei einzelnen Bildern war das nie ein Problem so lange zu warten aber bei ganzen Animationen mehrere Tage oder Wochen zu warten und dabei nichts an meinem PC machen zu können war die Hölle

You earned my respect brother

For my short, low budget renders, I usually up the samples a bit, and just turn off noise threshold. It works for my use case.

Bro, you are a freaking life saver

greatest blender video on earth...

You are an angel! Thank you so much!

I found this myself recently, very cool

Good one buddy. i was taking to long to render, you saved my ass hahaha

Sehr gut. Werde ich gleich mal testen.

Very interesting, thank you for sharing !

I just tried this tonight (after waiting a loong time to get my new memory and GPU) and getting to a point where I wanted to try a proper render. I rendered a butterfly model with HDRI for lighting and background at 2K resolution I think or double whatever it was at and used the 1.0 noise and 1024 samples. It rendered in like 7 seconds. Was large and looked nice. I used only Optix GPU, no CPU. So... I don't completely understand the best ways to do various things but this seemed to be very fast with only a butterfly and sphere and HDRI and nothing special like volume etc. thx!!!

THANK YOU SO MUCH. You saved me millions of hours😭❤❤

Thanks for the video it helped me a lot.

Yes, and you can also do something like 0.05 to 0.1 and 4096 samples (to avoid to double the resolution and min samples 16), with ODIN and after a pass of OPTIX temporal and it's good. Nice video.

interesting now I want to try it

Thats a really strange and extremely cool animation

I do not know how to thank you for this video it was spending from me to render a photo 2 hours but after this it took just 2 minutes thanks sooooo mush

I do this, also i make the frame range 2 steps, then use Flow frames to fill in the missing frames. Results look pretty dang good.

Woow i should definitely give this one a try

Terrific! Thanks.

Thanks for sharing. Very helpful.

Thanks. This is a great tip.

Thanks for this awesome trick! My render went from 5 days to 2 and a half days

Wow! I've got to try this.

This is actually insane. The crazy long render time was one of the main reasons I quit

Thank you for the tutorial

Good work you have

Thank you so much for sharing this information!🥲❤️Helped on my first client project!

i did this as well for the last few weeks, increased my productivity in blender that now i'm running out of ideas because of how efficient it is now lol

I'm lucky to find your channel ... 🎉🎉🎉

i have one tip that will increase realism... make the windows less shiny.. just walk out on city and you will notice that window lights are way more dimmer.

Thank you so much. I am a filmmaker and enjoyed watching your animation but wanted to offer this thought: While your camera angles where quite exciting they totally give the game away that "it is not real." No "physical" camera can pull off those moves and thus the illusion is lost. Yes, you can get all of those beautiful angles, but only by cutting between different cameras. You could improve your result just by cutting in the edit, it would be much more convincing and thus more exciting. Lots of cuts is what makes our eyes flicker, it excites us. Thanks again for the tip on render times. I will be trying that today.

Thanks will try this soon!

Danke, das hat sehr geholfen 👍

thats a great tip thankyou.

This really works 🤑 THANK YOU

you're the best, my shit went from 10 minutes to 1 minute lmao

klasse´muss ich gleich mal probieren. Danke

it damm works... :O of course not gonna lie if u watch super carefully like in interior you lose some sharpness etc but the difference isnt that much and you need to compare them carefully which is 20 mins and wich 30 seconds :O this is LIFE CHANGING

🥇 David, I did not believe you at first. I tried it on my end, oMG 😳. In fraction of a time, my render was finished. Thank you for this video.

Thanks man, it worked for me too.

thats amazing thanks

Thanks. I believe it works for me

nice man thank you so much :)

Thank you sir. Excellent

man HUGE thanks

Mega! Danke!