This strat is only usable right to left. This room has many offscreen shot blocks. Shooting enough of them with wave + spazer or wave + plasma allows you to pass through the speed blocks. There is just enough time to pass through all of the Speed blocks before they become solid again.

Requires:

{
  "notable": "Shot Block Overload (Speedless Speedway)"
}
"Wave"
{
  "or": [
    "Spazer",
    "Plasma"
  ]
}
{
  "enemyDamage": {
    "enemy": "Beetom",
    "type": "contact",
    "hits": 3
  }
}
{
  "or": [
    "Ice",
    {
      "ammo": {
        "type": "Missile",
        "count": 1
      }
    },
    {
      "ammo": {
        "type": "Super",
        "count": 1
      }
    },
    "ScrewAttack",
    {
      "and": [
        {
          "enemyDamage": {
            "enemy": "Beetom",
            "type": "contact",
            "hits": 5
          }
        },
        "h_canBombThings"
      ]
    },
    {
      "enemyDamage": {
        "enemy": "Beetom",
        "type": "contact",
        "hits": 15
      }
    }
  ]
}