slow with large MPD

[3052]

http://abjuhnpaaaaaaaamg6l3majym4tx5.s3-iad-2.cf.dash.row.aiv-cdn.net/68c9/0966/cdeb/4cec-bbbb-8129644897e8/0b42a3d4-d856-4cab-a1b1-500b743f202d_corrected.mpd

take 2 minute to parse

https://github.com/nilaoda/N_m3u8DL-RE/releases/tag/v0.2.0-beta

77,948,699 bytes

[3052]

this code can parse in 2 seconds:

package main

import (
   "154.pages.dev/dash"
   "os"
)

// TotalSeconds      : 1.9082671
func main() {
   text, err := os.ReadFile("0b42a3d4-d856-4cab-a1b1-500b743f202d_corrected.mpd")
   if err != nil {
      panic(err)
   }
   var mpd dash.MPD
   mpd.Unmarshal(text)
}