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There could be several reasons why boost::circular_buffer is performing slowly in your benchmark. Some possible causes include:

1. The size of the circular buffer: If the size of the circular buffer is too large or too small, it can have an impact on performance.

2. The allocation strategy: boost::circular_buffer uses a fixed-size buffer, so if the buffer needs to be resized frequently, it can impact performance. You may want to consider tweaking the buffer size or allocation strategy to improve performance.

3. The type of operations being performed: Different operations (e.g. insertion, deletion, iteration) may have different performance characteristics. Depending on your use case, you may need to optimize for specific operations.

4. Your hardware platform: The performance of boost::circular_buffer can be affected by your hardware platform (e.g. CPU, memory speed). You may want to benchmark the library on different hardware platforms to see how performance varies.

5. Your benchmark methodology: Your benchmark methodology may be flawed, leading to inaccurate performance measurements. You may want to re-evaluate your benchmark methodology to ensure that it accurately reflects your use case.