get worse performance after changing from jemalloc to mimalloc

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Hi,
I have a rust app using jemalloc, when changing to mimalloc , our app get slower:
the rust wrapper: https://github.com/purpleprotocol/mimalloc_rust shows it's backed by version: mimalloc v2.2.4

adding these options as environment variable, but no improvement:
env MIMALLOC_VERBOSE=1 MIMALLOC_SHOW_STATS=1 MIMALLOC_SHOW_ERRORS=1 MIMALLOC_PURGE_DELAY=100 MIMALLOC_USE_NUMA_NODES=1 MIMALLOC_RESERVE_HUGE_OS_PAGES=200 MIMALLOC_EAGER_COMMIT_DELAY=1 ./program

there are some heap info from stderr, I am very new to mimalloc, it seems 0 pages and cached for unknown reason:

Linux kernel: 6.1.119

and the perf trace shows an overhead from mimalloc took pretty much CPU cycles:

```
Samples: 389K of event 'cycles', Event count (approx.): 6934350124
Overhead Shared Object Symbol
11.83% program [.] mi_heap_collect_ex
8.76% program [.] _mi_page_free_collect
4.76% libc-2.26.so [.] __memcpy_avx_unaligned_erms
4.57% program [.] program::test1::benchmark::flush
3.12% program [.] program::test1::lib::custom_map::remove_item
2.74% program [.] _mi_page_malloc
```
Thanks for advise!

Start with the Rust wrapper version and the provided perf trace, focusing on program::test1::benchmark::flush, mi_heap_collect_ex, _mi_page_free_collect, and _mi_page_malloc. Reproduce the workload while comparing jemalloc and mimalloc with the listed environment settings; done requires a measured, reproducible explanation of the performance difference.

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