{
  "slow": [
    "@svg (fmt/91, fmt/92 and fmt/413 have *<svg which slows down xml identification)",
    "@pdfextra",
    "fmt/12 (PNG 1.1 - versions 1.1 and 1.2 slow down PNG identification)",
    "fmt/13 (PNG 1.2 - ... these aren't really format versions anway, just later versions of spec with added features)"
  ]
}