The title says it. Besides, I also tried Spectrum with 77 mods and the fps are still at 15.
I tried the mod on another PC four times better than mine and the fps was 100.

I think the mod is not very optimized.

CPU: Intel i5-4590 (4) @ 3.700GHz
GPU: NVIDIA GeForce GT 610
RAM: 4G

Can you use the mod Spark and run a client performance profile, please? That should give us a lot of information on what's taking up all your PCs resources.

Can you use the mod Spark and run a client performance profile, please? That should give us a lot of information on what's taking up all your PCs resources.

https://spark.lucko.me/zt3Q9gogAH : Running /sparkc profiler

errrr my friend has a gtx 710 and FPS is at 26 in fullscreen (and i'm quite sure the cause isn't spectrum)... get a better GPU

but let me see if it is spectrum

nope, spectrum does NOT affect FPS

In my Mod Pack I play at 60 FPS with Spectrum installed, it drops to 15.

¿What would be the reason Spectrum needs a better GPU?

first of all, you're running a 10 year old GPU and expecting minecraft to perform well
also, this is either a mod conflict, an old version of spectrum, or another mod

I'm running my own modpack at 100fps and it has spectrum installed, either your GPU sucks or you have a mod conflict

and my GPU is a quadro m1000m, equivalent to a GTX 660 in performance

My modpack has almost all performance mods (Sodium, Lithium, Startlight, etc)

No mod conflicts as I tried Spectrum alone and same 15 FPS results.

do you have mods like sodium?

check your settings, you might've set max FPS to 15 by accident, also make sure to disable vsync

MY CONCLUSION: To run Spectrum you must have a high performance PC.

check. your. settings.

None of that has anything to do with it. When installing the mod the fps go down to 15 when removing the mod they go up to 60

The problem is my PC.

is the FPS always locked at 15 or does it fluctuate?

The FPS will depend on the power of the PC.

One solution to the problem is to have a good PC or the other solution would be to improve the optimization of the mod.

And,if you installed too many mods,or limited the FPS in the options,that FPS would be limited. Try to toggle the FPS limit to "unlimited",if you do. Also,try to install mods that optmize the FPS,such as Ferrite Core.

And,if you installed too many mods,or limited the FPS in the options,that FPS would be limited. Try to toggle the FPS limit to "unlimited",if you do. Also,try to install mods that optmize the FPS,such as Ferrite Core.

I have FerriteCore also set FPS to max, disabled various high impact sodium options. gave the same result 15 FPS.

And as I said in the description I tried it on a better PC than mine and the FPS was good, coming to my conclusion that the mod is not optimized or I'm wrong.

This is likely the same issue as #84. Check your mod list for incompatibilities.

This is likely the same issue as #84. Check your mod list for incompatibilities.

• Spectrum without other mods 15 FPS
• Spectrum with other mods 15 FPS
• Without Spectrum alone or with mods 60 FPS

Sorry for only getting back to you now.
Your profile does not mention a performance impact by Spectrum in any way. While I believe you might still very well be correct, it seems I can not help you with that, sorry.