Qwen3.8 125B (6B active) Flash-Next

User reports Qwen3.8-Flash-Next at 48.02 t/s short decode and 1429 t/s prefill on an RTX 5090 32GB with 128GB DDR5 system RAM. Setup is llama.cpp PR #27742 with UD-Q2_K_XL (78.9GB in 3 shards), 64k context, -ngl 999 and -ncmoe 24 keeping the first 24 layers' experts on the CPU, no speculative decoding, single stream. Decode after about 16k tokens of input is 43.28 t/s, time to first token is 11.0 s at about 16k input, and VRAM use is about 30.9GB.