Samus will be slowed by lava if SpeedBooster is equipped, even with Gravity.

Requires:

{
  "or": [
    "h_lavaProof",
    "canSuitlessLavaDive"
  ]
}
{
  "or": [
    {
      "and": [
        "HiJump",
        {
          "heatFrames": 270
        },
        {
          "lavaFrames": 270
        }
      ]
    },
    {
      "and": [
        {
          "heatFrames": 295
        },
        {
          "lavaFrames": 295
        }
      ]
    }
  ]
}
{
  "or": [
    "canTrickyJump",
    {
      "and": [
        {
          "heatFrames": 60
        },
        {
          "lavaFrames": 60
        }
      ]
    }
  ]
}
{
  "or": [
    {
      "and": [
        "SpaceJump",
        "canCarefulJump",
        {
          "heatFrames": 100
        }
      ]
    },
    {
      "and": [
        "canWalljump",
        {
          "heatFrames": 60
        }
      ]
    },
    {
      "and": [
        "canSpringBallJumpMidAir",
        {
          "heatFrames": 100
        }
      ]
    },
    {
      "and": [
        "canBombJumpWaterEscape",
        {
          "heatFrames": 180
        },
        {
          "lavaFrames": 30
        }
      ]
    },
    {
      "and": [
        "HiJump",
        {
          "heatFrames": 60
        },
        {
          "lavaFrames": 10
        }
      ]
    }
  ]
}

Dev note: Varia no etanks is barely possible with vanilla Varia. Assumes waiting for the first namihe fireball if you are not practiced with the room.