Are you playing on a laptop or old PC? Maybe you need a better graphics card. (Although if you can run other games fine, it must be something else.)
He use a "NVIDIA GeForce GTX 1070" graphic card which does meet Minecraft's system requirements!
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Yes! Adding RAM also cause problems, the sweet spot was 8Gbs. (With 130 mods). Plus removed some mods (at random), running with 90 mods now, still happened.
Updated: I was able to replicate the issue with PreGenForge, loading 128 chunks. Around 10% it happened again. So I tried with no mods (besides PreGenForge and TerraForged), it works just fine, 128 chunks loaded in around 40min or so. So, I think you are right, it might be a mod. Now is just a matter of replicating the issue over and over to find the mod(s) causing the issue.