Greedy State Boundary Search (GSBS) identifies transitions between relatively stable neural activity patterns, but repeated candidate evaluation makes large analyses expensive. HP-GSBS is an open-source Python package that reorganizes the search around reusable interval contributions and correlation statistics. Streaming candidate reduction and local refinement further reduce repeated work; CPU, PyTorch CUDA and Triton backends share sequential segmentation decisions. Across seven controlled workloads with two realizations each, median same-input speedups range from 154 to 1730 times. All 168 optimized executions reproduce original boundaries and selected state counts, with maximum absolute t-distance difference $1.88\times10^{-11}$. Four frozen EEG recordings provide complementary validation, including a complete input-to-segmentation application example. Batch processing, versioned result persistence and optional low-memory execution support recording collections and longer inputs. By removing redundant computation, HP-GSBS makes established neural-state segmentation faster while preserving its scientific outputs.

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