DualCFGGuider & PerpNegGuider: unable to "turn off" negative conditioning with CFG = 1...rendering times TRIPLE! #8787
Description
Custom Node Testing
- I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)
Expected Behavior
There should be a way to "turn off" negative conditioning using CFG = 1 for DualCFGGuider and PerpNegGuider, so render times don't TRIPLE without any benefit at all.
Setting CFG =1 for CFGGuider works as expected and does not double render time.
Actual Behavior
I've posted my test results below using a very simple generic workflow with only native nodes.
FLUX
Positive → Guidance [3.5] → BASIC ... 55 sec.
Positive → Guidance [3.5] → CFGGUIDER [cfg 1] ... 48 sec.
Negative
Positive → Guidance [3.5] → CFGGUIDER [cfg 3] ... 89 sec.
Negative
Positive → Guidance [3.5] → PERPNEGGUIDER [cfg 1, neg_scale 1] ... 149 sec.
Negative
Empty
Positive → Guidance [3.5] → PERPNEGGUIDER [cfg 1, neg_scale 0] ... 140 sec.
Negative
Empty
Positive → Guidance [3.5] → PERPNEGGUIDER [cfg 1, neg_scale 0] ... 141 sec.
Negative → CondZeroOut
Empty
Positive → Guidance [3.5] → PERPNEGGUIDER [cfg 1, neg_scale 0] ... 138 sec.
Negative → CondZeroOut
Empty → CondZeroOut
Positive → Guidance [3.5] → PERPNEGGUIDER [cfg 1, neg_scale 1] ... 138 sec.
Negative → CondZeroOut
Empty → CondZeroOut
Positive → Guidance [3.5] → DUALCFGGUIDER [cfg 1, cfg2/neg 1] ... 151 sec.
Empty
Negative
Positive → Guidance [3.5] → DUALCFGGUIDER [cfg 1, cfg2/neg 1] ... 158 sec.
Empty → CondZeroOut
Negative → CondZeroOut
SDXL
Positive → BASIC ... 10 sec.
Positive → CFGGUIDER [cfg 1] ... 11 sec.
Negative
Positive → CFGGUIDER [cfg 3] ... 17 sec.
Negative
Positive → PERPNEGGUIDER [cfg 1, neg_scale 1] ... 26 sec.
Negative
Empty
Positive → PERPNEGGUIDER [cfg 1, neg_scale 0] ... 26 sec.
Negative
Empty
Positive → DUALCFGGUIDER [cfg 3, cfg2/neg 1] ... 26 sec.
Empty
Negative
Steps to Reproduce
Create a simple generic workflow with either of the problematic guider nodes, setting negative CGF to 1, and compare rendering times against CFGGuider, which is working as expected.
Debug Logs
---Other
It would be nice if rendering times didn't double or triple for Flux models regardless of what is set for the negative CFG value (since they don't use them anyway and maybe you accidentally forget to change that setting), but they shouldn't triple when explicitly set to 1.