df: improve perfs #6786

Job	Run time
L10n/Clap Error Localization Test	1m 8s
L10n/Build and Test (windows-latest, feat_os_windows)	5m 44s
L10n/Locale Support Verification	5m 41s
L10n/Build and Test (macos-latest, feat_os_macos)	2m 5s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	3m 9s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	2m 29s
L10n/Fluent Syntax Check	17s
L10n/French Integration Test	1m 2s
L10n/Embedded Locale Regression Test	1m 15s
L10n/Locale Embedding - Multicall Binary	2m 6s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	7m 58s
L10n/Locale Embedding - Ls Utility	51s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	5m 8s
L10n/Locale Embedding - Cat Utility	37s
L10n/Locale Embedding - Cargo Install	54s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	3m 3s
L10n/Locale Embedding Regression Test	3s
	43m 30s

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