Not sure how many tubes are there. Cylinders can be high ploy but in this instance not sure of the number.
Whatever the ins and outs clearly given the number of entities all of the same single unique object in an otherwise empty level and looking away from the entities towards completely open empty flat terrain one should not be seeing frame rates at 9fps. Such returns would preclude building complex worlds of the scale of Reloaded anything like exist in reality.
Even in game levels that do not visually approach anything like visual reality complexity in the real world if one were to count the number of both unique and individual instances of entities in a game level its is surprising how many it can get to even as said in a relatively visually empty level. In a City for instance people, vehicles, lamp posts, street furniture, fences and so on, or even inside a single building doors windows, lifts, desks, fire extinguishers and so on.
Even in FPSC Classic I had used and exceeded 1000 entities in a single level and still get playable gameplay speeds maintained of over 30fps.
Whatever the reasons as said it should not be happening and working as it is in Reloaded or you will have no scope to build from empty level start. In a situation as in the video or any game level the Cylinders or anything else should not always be active and or impacting if they cannot be seen by the player/camera and in such instances ways of removing any such impact/influence should be found.
Not sure if its just the latest versions, its still beta and things may improve.
Users of course do need to use some judgement too in building worlds and how they design them and what they place in them and how and where so as to help. Cylinders and Spheres even more so can be a severe drain I know historically in game engines and if used should be kept to a minimum of polys given that of course affects quality of the curved surfaces.
Still seems like and in my own experience and feedback to date too Reloaded will need a lot of work and time to pass by yet before it can be said to be capable.