I was curious about this one, so I did the change and ran the benchmarks. The results were surprising though; it was slower!

Here's the results:

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.22000
Intel Core i7-7700K CPU 4.20GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
.NET SDK=7.0.100-alpha.1.21467.19
  [Host]     : .NET 5.0.10 (5.0.1021.41214), X64 RyuJIT
  Job-KJFVRU : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT
  Job-MZHKWO : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT

IterationCount=3  LaunchCount=1  WarmupCount=3

Method	Job	Toolchain	Size	Mean	Error	StdDev	Ratio	RatioSD	Gen 0	Allocated
Medium	Job-KJFVRU	main	1	6.512 ns	2.859 ns	0.1567 ns	1.00	0.00	0.0057	24 B
Medium	Job-MZHKWO	PR	1	13.985 ns	2.461 ns	0.1349 ns	2.15	0.07	0.0134	56 B

Medium	Job-KJFVRU	main	2	6.360 ns	1.075 ns	0.0589 ns	1.00	0.00	0.0076	32 B
Medium	Job-MZHKWO	PR	2	14.040 ns	3.786 ns	0.2075 ns	2.21	0.03	0.0153	64 B

Medium	Job-KJFVRU	main	4	6.149 ns	3.932 ns	0.2155 ns	1.00	0.00	0.0076	32 B
Medium	Job-MZHKWO	PR	4	14.773 ns	12.972 ns	0.7110 ns	2.40	0.10	0.0153	64 B

Medium	Job-KJFVRU	main	5	6.680 ns	1.670 ns	0.0916 ns	1.00	0.00	0.0076	32 B
Medium	Job-MZHKWO	PR	5	13.978 ns	12.688 ns	0.6955 ns	2.09	0.08	0.0172	72 B

Medium	Job-KJFVRU	main	8	7.167 ns	3.092 ns	0.1695 ns	1.00	0.00	0.0096	40 B
Medium	Job-MZHKWO	PR	8	15.836 ns	3.509 ns	0.1924 ns	2.21	0.05	0.0191	80 B

Medium	Job-KJFVRU	main	10	7.764 ns	5.893 ns	0.3230 ns	1.00	0.00	0.0115	48 B
Medium	Job-MZHKWO	PR	10	15.461 ns	9.475 ns	0.5194 ns	1.99	0.07	0.0229	96 B

Medium	Job-KJFVRU	main	12	7.629 ns	3.200 ns	0.1754 ns	1.00	0.00	0.0115	48 B
Medium	Job-MZHKWO	PR	12	16.313 ns	12.362 ns	0.6776 ns	2.14	0.12	0.0229	96 B

Medium	Job-KJFVRU	main	16	8.485 ns	4.583 ns	0.2512 ns	1.00	0.00	0.0134	56 B
Medium	Job-MZHKWO	PR	16	16.567 ns	14.305 ns	0.7841 ns	1.96	0.14	0.0268	112 B

Medium	Job-KJFVRU	main	32	10.847 ns	2.463 ns	0.1350 ns	1.00	0.00	0.0210	88 B
Medium	Job-MZHKWO	PR	32	17.667 ns	6.613 ns	0.3625 ns	1.63	0.03	0.0421	176 B

Medium	Job-KJFVRU	main	64	16.476 ns	6.452 ns	0.3537 ns	1.00	0.00	0.0363	152 B
Medium	Job-MZHKWO	PR	64	24.305 ns	5.120 ns	0.2806 ns	1.48	0.02	0.0727	304 B

Medium	Job-KJFVRU	main	128	29.586 ns	14.826 ns	0.8127 ns	1.00	0.00	0.0669	280 B
Medium	Job-MZHKWO	PR	128	35.916 ns	33.364 ns	1.8288 ns	1.22	0.09	0.1339	560 B

Medium	Job-KJFVRU	main	256	54.535 ns	22.270 ns	1.2207 ns	1.00	0.00	0.1281	536 B
Medium	Job-MZHKWO	PR	256	61.755 ns	20.355 ns	1.1157 ns	1.13	0.02	0.2563	1,072 B

Use Span<Char>.Fill in String(Char, Int32) constructor #57993

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