Chatda

Find files by name and by what's inside.

How fast it is

Item	Another file search program	Chatda
First indexing	47–48 s	16–17 s
One-letter search	115–128 ms	87–92 ms
Other searches (7 kinds)	118–201 ms	34–54 ms
Memory after indexing	910 MB	765 MB
Peak memory	1,597 MB	1,083 MB
Index file	381 MB	125–132 MB
Ready to search after reopening	2.9 s	1.6–1.7 s

Measured on one PC: Windows 10 Pro, AMD Ryzen 5 8500G (12 threads), 31 GB RAM, NVMe SSD. Results on your PC will differ.
Both programs indexed the same files: the whole C: drive, about 11.8 million files (11,681,482 matched when the two lists were compared). Chatda also indexed the text inside documents.
First indexing was timed twice for each program, taking turns. Search times are the median of 30 runs of the same search, until the first 100 results appeared.
The other program's search times were taken with its command-line tool, which adds a fixed start-up cost of about 7 ms. Chatda is faster in every search even with that cost removed.
Chatda had “Include all files” turned on. Its default settings skip developer folders such as node_modules and are lighter: 13 s to index and 224 MB of memory for 2.9 million files.