diff --git a/.romm/.env b/.romm/.env
index 53d32d9..49e9232 100644
--- a/.romm/.env
+++ b/.romm/.env
@@ -1,6 +1,6 @@
 HOST="<romm host>"
 USERNAME="<romm user>"
 PASSWORD="<romm password>"
-# INCLUDE_PLATFORMS and EXCLUDE_PLATFORMS are mutially exclusive. If you define one, the other will be ignored. INCLUDE_PLATFORMS will take precedence.
+# INCLUDE_PLATFORMS and EXCLUDE_PLATFORMS are mutually exclusive. If you define one, the other will be ignored. INCLUDE_PLATFORMS will take precedence.
 INCLUDE_PLATFORMS=["gb", "gba", "gbc", "nes", "snes"]
 EXCLUDE_PLATFORMS=["win", "n3ds"]
diff --git a/.romm/api/api.py b/.romm/api/api.py
index 4d529e5..92fabe9 100644
--- a/.romm/api/api.py
+++ b/.romm/api/api.py
@@ -27,11 +27,11 @@ def __init__(self):
             "utf-8"
         )
         self.__headers = {"Authorization": f"Basic {self.__auth_token}"}
-        self.__platforms = []
-        self.__exclude_platforms = os.getenv("EXCLUDE_PLATFORMS", [])
+        self.__exclude_platforms = set(os.getenv("EXCLUDE_PLATFORMS") or [])
+        self.__include_collections = set(os.getenv("INCLUDE_COLLECTIONS") or [])
+        self.__exclude_collections = set(os.getenv("EXCLUDE_COLLECTIONS") or [])
         self.__collections = []
-        self.__include_collections = os.getenv("INCLUDE_COLLECTIONS", [])
-        self.__exclude_collections = os.getenv("EXCLUDE_COLLECTIONS", [])
+        self.__platforms = []
         self.__roms = []
 
     @staticmethod
@@ -186,90 +186,92 @@ def download_rom(self, rom, dest_path):
         return (True, True)
 
 
-MUOS_SUPPORTED_PLATFORMS = [
-    "acpc",
-    "arcade",
-    "arduboy",
-    "atari2600",
-    "atari5200",
-    "atari7800",
-    "jaguar",
-    "lynx",
-    "atari-st",
-    "wonderswan",
-    "wonderswan-color",
-    "cave-story",
-    "chailove",
-    "chip-8",
-    "colecovision",
-    "amiga",
-    "c128",
-    "c64",
-    "cpet",
-    "vic-20",
-    "dos",
-    "doom",
-    "fairchild-channel-f",
-    "vectrex",
-    "galaksija",
-    "g-and-w",
-    "j2me",
-    "lowres",
-    "lua",
-    "odyssey--1",
-    "intellivision",
-    "mega-duck-slash-cougar-boy",
-    "msx",
-    "turbografx-16-slash-pc-engine-cd",
-    "supergrafx",
-    "turbografx16--1",
-    "pc-8000",
-    "pc-fx",
-    "pc-9800-series",
-    "nds",
-    "fds",
-    "gba",
-    "gbc",
-    "gb",
-    "n64",
-    "nes",
-    "famicom",
-    "snes",
-    "sfam",
-    "pokemon-mini",
-    "virtualboy",
-    "openbor",
-    "pico-8",
-    "philips-cd-i",
-    "quake",
-    "rpg-maker",
-    "neogeoaes",
-    "neogeomvs",
-    "neo-geo-cd",
-    "neo-geo-pocket",
-    "neo-geo-pocket-color",
-    "scummvm",
-    "sega-32x",
-    "dc",
-    "gamegear",
-    "sega-master-system",
-    "genesis-slash-megadrive",
-    "sega-pico",
-    "segacd",
-    "sg1000",
-    "saturn",
-    "x1",
-    "sharp-x68000",
-    "sinclair-zx81",
-    "zxs",
-    "ps",
-    "psp",
-    "tic-80",
-    "ti-83",
-    "3do",
-    "uzebox",
-    "vemulator",
-    "wasm-4",
-    "watara-slash-quickshot-supervision",
-    "wolfenstein-3d",
-]
+MUOS_SUPPORTED_PLATFORMS = frozenset(
+    (
+        "acpc",
+        "arcade",
+        "arduboy",
+        "atari2600",
+        "atari5200",
+        "atari7800",
+        "jaguar",
+        "lynx",
+        "atari-st",
+        "wonderswan",
+        "wonderswan-color",
+        "cave-story",
+        "chailove",
+        "chip-8",
+        "colecovision",
+        "amiga",
+        "c128",
+        "c64",
+        "cpet",
+        "vic-20",
+        "dos",
+        "doom",
+        "fairchild-channel-f",
+        "vectrex",
+        "galaksija",
+        "g-and-w",
+        "j2me",
+        "lowres",
+        "lua",
+        "odyssey--1",
+        "intellivision",
+        "mega-duck-slash-cougar-boy",
+        "msx",
+        "turbografx-16-slash-pc-engine-cd",
+        "supergrafx",
+        "turbografx16--1",
+        "pc-8000",
+        "pc-fx",
+        "pc-9800-series",
+        "nds",
+        "fds",
+        "gba",
+        "gbc",
+        "gb",
+        "n64",
+        "nes",
+        "famicom",
+        "snes",
+        "sfam",
+        "pokemon-mini",
+        "virtualboy",
+        "openbor",
+        "pico-8",
+        "philips-cd-i",
+        "quake",
+        "rpg-maker",
+        "neogeoaes",
+        "neogeomvs",
+        "neo-geo-cd",
+        "neo-geo-pocket",
+        "neo-geo-pocket-color",
+        "scummvm",
+        "sega-32x",
+        "dc",
+        "gamegear",
+        "sega-master-system",
+        "genesis-slash-megadrive",
+        "sega-pico",
+        "segacd",
+        "sg1000",
+        "saturn",
+        "x1",
+        "sharp-x68000",
+        "sinclair-zx81",
+        "zxs",
+        "ps",
+        "psp",
+        "tic-80",
+        "ti-83",
+        "3do",
+        "uzebox",
+        "vemulator",
+        "wasm-4",
+        "watara-slash-quickshot-supervision",
+        "wolfenstein-3d",
+    )
+)