Roblox occupies an odd position in PC hardware discussions. It is one of the most-played pieces of software on the planet, it runs on hardware that would struggle with anything else, and consequently almost nobody benchmarks it. When somebody asks what they need to run it well, the answer they usually get is a shrug and ‘anything’.
That answer is wrong in an interesting way. Roblox does run on almost anything. But running it and running it well are different propositions, and the bottlenecks are not the ones people expect.
It is a CPU problem, not a GPU problem
The single most important thing to understand is that Roblox performance is overwhelmingly bound by single-threaded CPU performance.
Every experience on the platform is a Lua script running on top of the engine. Physics, game logic, replication and most of the per-frame work happen in ways that lean heavily on one core. Adding cores helps far less than you would expect, and adding GPU horsepower helps almost not at all in the scenarios where people actually complain about performance.
The practical consequence is that a modern budget CPU with strong single-core performance will run Roblox better than an older high-core-count workstation part. It also means a graphics card upgrade is usually the wrong purchase if Roblox is the reason you are upgrading. You will see a difference at very high resolutions and with the graphics quality slider pushed up, but the frame drops that annoy people mostly are not GPU-bound.
Player count is the real variable
The thing that actually destroys frame rates is other players.
An empty studio scene runs at absurd frame rates on anything. Load into a busy server with dozens of players, each with a rendered avatar, accessories, animations and network updates arriving continuously, and the same machine can struggle badly.
This is why performance feels so inconsistent. It is not the game, it is the server population at that moment. Two sessions in the same experience can behave completely differently depending on how many people are in the lobby and how heavily accessorised their avatars are.
If you are troubleshooting for someone, this is the first thing to check. Frame rate in a private server versus a full public one tells you more than any benchmark.
Where the platform genuinely benefits from hardware
A few areas do reward better components.
Memory matters more than people assume. Roblox itself is not enormous, but experiences load large asset sets dynamically, and a machine with 8 GB shared with a browser full of tabs will hitch during loading. 16 GB removes most of that.
Storage speed affects load times noticeably. Asset streaming from a mechanical drive produces visible pop-in that an SSD eliminates.
High refresh rate displays are the upgrade that most changes the experience, because the platform will happily push well past 60 frames per second on modest hardware once you uncap it. For anything involving fast movement or reaction, that is a real advantage.
And a decent mouse sensor matters more here than the hardware press generally acknowledges, because a lot of these experiences are, mechanically, shooters.
The social games are a different workload
Worth separating out: the platform’s biggest social and round-based experiences behave differently from its action games.
Round-based social deduction games, of which Murder Mystery 2 is the most enduring example, are light on rendering and heavy on network consistency. What ruins them is not low frame rate but latency and packet loss, because outcomes hinge on who registered an action first. A player on a modest laptop with a wired connection will have a better time than someone on a strong desktop over congested Wi-Fi.
These games also carry item economies, and those economies are a large part of why players stay with them for years. Cosmetic knives and weapons are traded between players at understood values, with an active market that has outlasted several waves of platform trends. Players looking to acquire specific items without grinding rounds for them typically go to an mm2 shop rather than chasing drops, which tells you something about how established that secondary market has become.
For anyone benchmarking, the takeaway is that these titles are a networking test, not a hardware test. Judging a machine by them will mislead you.
A sensible build target
If you are specifying a machine where Roblox is a primary workload, the priorities in order are: a current-generation CPU with good single-core clocks, 16 GB of memory, an SSD, a high refresh rate monitor, and whatever GPU is left in the budget. That inverts the usual gaming build advice, and for this workload it is correct.
It is also a genuinely cheap specification. This is one of the few remaining cases where a modest, sensibly chosen machine delivers essentially the full experience, and where spending more buys very little. That is worth saying plainly, because a lot of parents are being sold far more hardware than the use case requires.