etcpak is an extremely fast Ericsson Texture Compression and Block Compression utility. Currently it's best suited for rapid assets preparation during development, when graphics quality is not a concern, but it's also used in production builds of applications used by millions of people.

Benchmark performed on an AMD Ryzen 9 7950X, using a real-life RGBA 16K × 16K atlas.

ETC1: ST: 797 Mpx/s, MT: 9613 Mpx/s
ETC2: ST: 356 Mpx/s, MT: 6378 Mpx/s
BC1: ST: 5730 Mpx/s, MT: 10174 Mpx/s
BC3: ST: 2437 Mpx/s, MT: 8568 Mpx/s
BC7: ST: 12.1 Mpx/s, MT: 225 Mpx/s

The same benchmark performed on Intel i7 1185G7:

ETC1: ST: 516 Mpx/s, MT: 2223 Mpx/s
ETC2: ST: 238 Mpx/s, MT: 984 Mpx/s
BC1: ST: 2969 Mpx/s, MT: 9199 Mpx/s
BC3: ST: 1351 Mpx/s, MT: 5503 Mpx/s
BC7: ST: 7.8 Mpx/s, MT: 21.3 Mpx/s

Apple M3 Max benchmark:

ETC1: ST: 204 Mpx/s, MT: 2455 Mpx/s
ETC2: ST: 101 Mpx/s, MT: 1231 Mpx/s
BC1: ST: 3255 Mpx/s, MT: 30366 Mpx/s
BC3: ST: 1147 Mpx/s, MT: 13238 Mpx/s
BC7: ST: 5.47 Mpx/s, MT: 65.8 Mpx/s

Why there's no image quality metrics? / Quality comparison.

etcpak can also decompress textures. Timings on Ryzen 7950X (all single-threaded):

ETC1: 604 Mpx/s
ETC2: 599 Mpx/s
BC1: 1634 Mpx/s
BC3: 1172 Mpx/s
BC7: 201 Mpx/s

i7 1185G7:

ETC1: 383 Mpx/s
ETC2: 378 Mpx/s
BC1: 1056 Mpx/s
BC3: 788 Mpx/s
BC7: 76 Mpx/s

M3 Max:

ETC1: 690 Mpx/s
ETC2: 786 Mpx/s
BC1: 2434 Mpx/s
BC3: 1414 Mpx/s
BC7: 406 Mpx/s

To give some perspective here, Nvidia in-driver ETC2 decoder can do only 42.5 Mpx/s.

Original image:

Compressed image:

ETC1:

ETC2:

BC1:

BC7: