As others pointed out, that's why JPEG XL's excellent support for progressive decoding is important. Other formats do not support progressive decoding at all or made it optional, so it cannot be even compared at this point. In the other words, the table can be regarded as an evidence that you can have both progressive decoding and performance at once.
There is no "throughput vs latency" here, there is no "start-up time" for decoding an image that's already in RAM. If a decoder decodes at 100MiB/s, and a picture is 10MiB, it's decoded in 0.1 seconds. If the decoder decodes at 1 MiB/s, the same picture is decoded in 10 seconds.
This isn't true for web use cases. There being able to start decoding from when the first bits arrive vs the last bits can make a difference (which JPEG-XL does a lot better than other image formats because it first sends all the DC coefficients which lets the website display a low resolution version of the image and then fill in the detail as the rest of the image comes through.
That's about progressive decoding, which isn't what this benchmark is focusing on. When benchmarking decode speed, throughput is a perfectly good metric. If the article wanted to talk about progressive decode performance, it would require a complete redesign, not just a change in metric from "throughput" to "latency".
As others pointed out, that's why JPEG XL's excellent support for progressive decoding is important. Other formats do not support progressive decoding at all or made it optional, so it cannot be even compared at this point. In the other words, the table can be regarded as an evidence that you can have both progressive decoding and performance at once.
There is no "throughput vs latency" here, there is no "start-up time" for decoding an image that's already in RAM. If a decoder decodes at 100MiB/s, and a picture is 10MiB, it's decoded in 0.1 seconds. If the decoder decodes at 1 MiB/s, the same picture is decoded in 10 seconds.
This isn't true for web use cases. There being able to start decoding from when the first bits arrive vs the last bits can make a difference (which JPEG-XL does a lot better than other image formats because it first sends all the DC coefficients which lets the website display a low resolution version of the image and then fill in the detail as the rest of the image comes through.
That's about progressive decoding, which isn't what this benchmark is focusing on. When benchmarking decode speed, throughput is a perfectly good metric. If the article wanted to talk about progressive decode performance, it would require a complete redesign, not just a change in metric from "throughput" to "latency".
If you don't have progressive decoding, those metrics are essentially the same.