I’m new here so I apologize if I posted this on the wrong category.
I’m making a arguably large realistic-style map and have been thinking to use Blender 3D models as buildings instead of making them in Roblox studio, will large multiple (30+) realistic buildings made in Roblox studio lag the game? If so, do blender models significantly reduce lag and are there any other ways to reduce lag?
3D Blender models reduce lag a lot compared to inbuilt Roblox parts.
30+ realistic models made from blender could cause some lag so try to limit the number of parts/triangles used.
entirely depends on the tri count of the buildings and the complexity at which it is modeled. a good first step would be exporting the roblox made model into blender and removing any faces that aren’t visible
Meshes are more optimized than parts for face to stress count, therefore they produce less lag, but they do have wonky collisions. They don’t specifically have to be in blender, though.
Roblox terrain is also optimized, try using Roblox terrain to make terrain instead of parts.
Hey! I’m @Lil_SharkyBoy a 3D Artist and a Graphic Designer (self-proclaimed) on the platform. Well, to be honest I been working on the platform and using Blender for already some months and I have seen that actually the MeshParts reduce a little bit the lag compared to a large scalable building using Parts on Studio. Some examples could be a machine, this one could be made on Studio but depends on the level of detail you want to reach!
A smoothie machine I made for Venti’s Cafe
This type of things could reach a 3D Software and what Studio does not! As you can see the level of detail is high compared to what you can reach on Roblox Studio also, the tris count isn’t more than just 50,000tris in total! This is a really good optimization for just one machine and you get a really cool detail on it!!
I always recommend to use Blender over Studio for crops, decorations and other stuff since Blender is a 3D Software specialized on the modeling of 3D Object!! Why not use a specialized software for the task you’re requiring that? (If you get what I mean)
Anyway, when it comes to large-scalable buildings well… Blender has TERRIBLE collisions when exporting and importing into ROBLOX. Also if you would want to have your 3D Object with some good materials / textures when imported to ROBLOX you’ll need to actually use Textures and UV Unwrapping and other software for the UV Mapping Edition and etc, etc.
It isn’t fair that I just support Blender (since is my favourite 3D Modeling Software!) but Studio has his own benefits and con! First of all is that when it comes to simplicity you could just use Studio and make something great but simple (I’m not a great fan of simplicity)!
Also, I love the look that can take Roblox Studio when it comes to terrain and combination with Blender (crops), etc! An example could be:
Took me like 15min to make the lighting and the pose for my character lol.
Anyway, when it comes to more detailed stuff well… Studio starts to become laggy and our game performance decreases since +count parts -performance!
Well, if you want to know more about the pros and con of Blender and same for Studio, I replied some time ago to someone that was asking what was better, Blender or Studio.
Link:
Well, this is all what I can say to you but I hope you actually take this tips / info and make a good game with a lot of improvement on the optimization!
lol dude youre using 50,000 triangles for ‘just one machine’ and you call that ‘good’ ???
and youre comparing a real time mobile optimized ancient game engine to a not real time rendering engine?
‘blender’s’ collisions don’t suck, its just inefficient to use the actual mesh for physics in ANY game engine, so its really roblox’s fault. you can easily get around the ‘crappy collision’ issue if you actually knew what you were talking about.
good luck not crashing people’s computers with 50k tri smoothie machines lol
Well, in first instance you can’t upload a machine of 50,000tris so I’ve reduced to 10,000tris that is the max and stills looking pretty good. 
Just gonna note on this:
BLENDER IS A MODELING PROGRAM/NOT A GAME ENGINE. (Although there is a game engine but ignore that XD)
ROBLOX STUDIO IS A GAME ENGINE WITHIN ITSELF.
Theres a huge difference there ^.
It doesnt matter how many tris a model has, it matters on how performance good it is.
Games like mario, doom, zelda, and others use low poly all the time in models since although its low poly, it can still look good depending on how it was made.
Using an absurd amount of tris for a single model that barely any would bother to look at most of the time is a waste of resources.
@Lil_SharkyBoy
I would personally not use a 50k tri model/10k tri model if it can be done in 5k tris or less since it’d be better for performance.
This is often the case why you would see people who make low poly models sell more since they’re often:
Yea its nice to flex that your model at 50k tris, but it aint nice for the game designer/person making the game since it takes up valuable resources. Especially on roblox where it has to be handled with many players, often some with low-end devices, and more.
I mean, I appluad anybody who can get low amount of tris, especially on characters 
And just to show how overkill 50k tris is for a vending machine, this link model is 12k tris. You can shove about 4 links into a vending machine.
Also collisions are sometimes bad because of optimization. However, in my opinion, it surprisngly works well for its job
