delliberate
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RE: DELL XPS 15 9550 - CPU speed cap on battery

I just had the same thing on a 9560 with the latest firmware / BIOS.  My cap was at 28x multipllier, so not massive but enough to cripple my audio DAW performance at high CPU demands.

Turns out it was caused by undervolting the CPU cache!  I applied a typical -120mv offset to both CPU core and cache using Throttlestop.  The cache offset caused the multiplier limit on battery - removing it (CPU core offset can stay in place) allowed me to hit the 34x multiplier on battery.

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