message: Cache isConfCallRoom
  This only needs to be calculated one per room
diff: @@ -43,7 +43,7 @@ export function getOnlyOtherMember(room, me) {
  return null;
  }
  -export function isConfCallRoom(room, me, conferenceHandler) {
  +function _isConfCallRoom(room, me, conferenceHandler) {
  if (!conferenceHandler) return false;
  if (me.membership != "join") {
  @@ -58,6 +58,26 @@ export function isConfCallRoom(room, me, conferenceHandler) {
  if (conferenceHandler.isConferenceUser(otherMember.userId)) {
  return true;
  }
  +
  + return false;
  +}
  +
  +// Cache whether a room is a conference call. Assumes that rooms will always
  +// either will or will not be a conference call room.
  +const isConfCallRoomCache = {
  + // $roomId: bool
  +};
  +
  +export function isConfCallRoom(room, me, conferenceHandler) {
  + if (isConfCallRoomCache[room.roomId] !== undefined) {
  + return isConfCallRoomCache[room.roomId];
  + }
  +
  + const result = _isConfCallRoom(room, me, conferenceHandler);
  +
  + isConfCallRoomCache[room.roomId] = result;
  +
  + return result;
  }
  export function looksLikeDirectMessageRoom(room, me) {
  