pizzarr.http_store_cache_time_seconds how long to cache web requests
pizzarr.nthreads number of threads for parallel codec operations (NULL = all CPUs). Set-once: takes effect only before the first zarrs operation. Use env var PIZZARR_NTHREADS for reliable session-level control.
pizzarr.concurrent_target codec concurrency level — how many codec operations zarrs runs in parallel within a single read/write call (NULL = zarrs default, typically CPU count). Can be changed at any time.
pizzarr.http_batch_range_requests whether HTTP stores use multipart range requests (TRUE by default). Set to FALSE for servers with incomplete multipart range support. Takes effect on next store open.