Fast Groups Bypasser V2 (All Groups)

Odd one to find bundled into a LoRA-stacking pack, and the README says so itself: this node has nothing to do with LoRAs. It's a straight port of Fast Groups Bypasser from rgthree-comfy, the quality-of-life node pack that's basically standard-issue in any ComfyUI install past the beginner stage. If you've never run into rgthree's stuff, worth knowing who's behind it: one person, going by rgthree (also self-published as Regis Gaughan III on the pack's own MIT license), a Google engineer in his day job who's written 399 of the ~422 commits in his repo himself. No team, no succession plan - just someone who kept building tools for his own workflows and shared them, and the community leans on them hard enough that when ComfyUI's late-2025 frontend rewrite (Nodes 2.0) broke his pack's rendering, Comfy Org named him directly in their own blog post asking users to be patient.

What the node actually does: as your workflow grows, you start grouping nodes visually - a whole ControlNet chain, an upscale pass, a batch of detailers - and at some point you want to switch entire groups on or off without deleting anything or rewiring. Fast Groups Bypasser scans your workflow for groups and generates a checkbox per group at runtime, so you get a dashboard of toggles instead of clicking into each group and setting every node inside it to bypass individually. That's the whole pitch, and it's also why the node's schema here looks empty - no fixed inputs, no fixed outputs, because the widgets are built dynamically from whatever groups exist in your graph the moment you add it. It shows up as an output node in ComfyUI because it acts on the workflow rather than passing data downstream to anything.

Configuration happens through the node's properties panel or right-click menu, not through connectable inputs: you can filter which groups it picks up by color code or by a regex against the group's title, choose a sort order (draw position, alphanumeric, or a custom alphabet you define), pick whether toggling a group bypasses it or mutes it, and set a restriction mode - the default lets any combination of groups be on, "max one" caps it at a single active group, "always one" forces exactly one on at all times (handy for A/B-ing a set of mutually exclusive pipeline branches).

Installing it: no separate step, it comes with the whole pack - through ComfyUI Manager, search "ComfyUI-NunchakuFluxLoraStacker," or:

cd ComfyUI/custom_nodes
git clone https://github.com/ussoewwin/ComfyUI-NunchakuFluxLoraStacker.git

Restart ComfyUI and it'll show up under utils.

Where this bites, straight from rgthree's own experience with the original: if the checkboxes render wrong, stack oddly, or the properties panel won't open, check whether you're on ComfyUI's Nodes 2.0 frontend before filing anything as a bug - that rewrite is exactly what broke this family of nodes in the upstream pack, and the maintainer's own diagnosis was that Nodes 2.0 "causes many problems and seems to be much slower for rendering, especially on larger workflows." The standing workaround in the community has been to switch Nodes 2.0 off and stay on the legacy canvas. Beyond that: since this node only sees groups that already exist in your graph, add it after you've grouped your nodes, not before - an empty dashboard usually just means there's nothing to find yet.