Does Optifine Make Minecraft Run Smoother Or Slower On A Low-End Gaming PC?

I have a pretty low-end PC that runs low-graphic games when it is having a good day (When it doesn't crash every two minutes).

I recently downloaded Optifine, and after a bit of playing, I noticed that sometimes I get big lag spikes. I can't determine if its Optifine causing the problem or if its actually my PC just being laggy by itself. I know Optifine promises that it makes minecraft run smoother, but considering sometimes things lie to make it look better, I would like to know if it actually does that.

Note: I do not play with shaders or texture packs, so those aren't the reason.

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