My workflow includes running benchmarks in the VS Code terminal regularly.

Currently I can't give the tasks longer names than 20 characters, because they would make the table overflow and break its layout. Therefore I'm suggesting a couple of changes to make the metric columns narrower.

(index)

• Rename the column to #. Saves 5-6 characters.

Latency average

• Limit its precision. The digits after the 5th one are just noise. While this won't save more than 1-2 characters, it will make the numbers easier to read.
• Optional: rename average to avg.

Latency median

• Rename median to 50%.
• Drop the ± part from the numbers. I don't think they give any actionable insight.
• Drop the trailing zeros. Round to integer when the median has too many digits.
• Return numbers, not strings.

These changes together may save 3-7 characters.

Throughput average

• Optional: rename average to avg.

Throughput median

• Rename median to 50%. Saves 3 characters.
• Return numbers, not strings.

Before

Inserting 50k elements into various data structures
┌─────────┬──────────────────────┬──────────────────────┬───────────────────────┬────────────────────────────┬───────────────────────────┬─────────┐
│ (index) │ Task name            │ Latency average (ns) │ Latency median (ns)   │ Throughput average (ops/s) │ Throughput median (ops/s) │ Samples │
├─────────┼──────────────────────┼──────────────────────┼───────────────────────┼────────────────────────────┼───────────────────────────┼─────────┤
│ 0       │ 'float keyed Map'    │ '3218139.39 ± 3.66%' │ '2756229.00 ± 146.00' │ '331 ± 2.19%'              │ '363'                     │ 312     │
│ 1       │ 'int keyed Map'      │ '2211478.20 ± 1.77%' │ '2076166.00'          │ '462 ± 1.06%'              │ '482'                     │ 453     │
│ 2       │ '10 int keyed Maps'  │ '1304029.77 ± 1.12%' │ '1218542.00'          │ '782 ± 0.88%'              │ '821'                     │ 767     │
│ 3       │ 'sparse Array, 0.5'  │ '147581.90 ± 1.37%'  │ '124250.00'           │ '7543 ± 0.44%'             │ '8048'                    │ 6776    │
│ 4       │ 'sparse Array, 0.1'  │ '655357.51 ± 0.44%'  │ '654250.00'           │ '1537 ± 0.43%'             │ '1528'                    │ 1526    │
│ 5       │ 'sparse Array, 0.05' │ '1293428.82 ± 0.42%' │ '1306833.50 ± 0.50'   │ '776 ± 0.51%'              │ '765'                     │ 774     │
└─────────┴──────────────────────┴──────────────────────┴───────────────────────┴────────────────────────────┴───────────────────────────┴─────────┘

After

Inserting 50k elements into various data structures
┌───┬──────────────────────┬──────────────────────┬──────────────────┬────────────────────────────┬────────────────────────┬─────────┐
│ # │ Task name            │ Latency average (ns) │ Latency 50% (ns) │ Throughput average (ops/s) │ Throughput 50% (ops/s) │ Samples │
├───┼──────────────────────┼──────────────────────┼──────────────────┼────────────────────────────┼────────────────────────┼─────────┤
│ 0 │ 'float keyed Map'    │ '3218139 ± 3.66%'    │ 2756229          │ '331 ± 2.19%'              │ 363                    │ 312     │
│ 1 │ 'int keyed Map'      │ '2211478 ± 1.77%'    │ 2076166          │ '462 ± 1.06%'              │ 482                    │ 453     │
│ 2 │ '10 int keyed Maps'  │ '1304029 ± 1.12%'    │ 1218542          │ '782 ± 0.88%'              │ 821                    │ 767     │
│ 3 │ 'sparse Array, 0.5'  │ '147581 ± 1.37%'     │ 124250           │ '7543 ± 0.44%'             │ 8048                   │ 6776    │
│ 4 │ 'sparse Array, 0.1'  │ '655357 ± 0.44%'     │ 654250           │ '1537 ± 0.43%'             │ 1528                   │ 1526    │
│ 5 │ 'sparse Array, 0.05' │ '1293428 ± 0.42%'    │ 1306833          │ '776 ± 0.51%'              │ 765                    │ 774     │
└───┴──────────────────────┴──────────────────────┴──────────────────┴────────────────────────────┴────────────────────────┴─────────┘

If you agree, I'm happy to send a pull request.