It all depends on how you design it, It's a very configurable junction with possible mainline offsets depending on how you make the crossover junctions.
However, it's not symmetric in the slightest, you can try to make it be, but it would only be eligible for rotational symmetry instead of mirrored symmetry due to the inevitable line offsets from the crossover bridges.
In-line version to show the difficulties of curves within the junction.
However, this junction is best suited for trains up to 100MPH in this configuration depending on where they come from, Here are the known junction statistics:
Classification: Suitable for either Single Mainline or Dual Isolated Mainline
Sharpest turn: 4
Cost: Approximately $77K to complete one
Construction Difficulty: Easy
Bridges / Tunnels: yes (interchangable)
Deadlock: No
Hills: No
Natural Turns: Yes
Split before merge: Yes
Area: ~23x~24 (Depending on configuration)
Symmetrical: No
U-turn and Loops: No
Signal type: Original
I tend to compare it with junctions like the Cloverleaf due to their direct mainline design and overall duty for a junction of this type.
Edit: It seems while experimenting with a cloverleaf of the same size mine does perform better on throughput, the only issue is that the cloverleaf can be designed a lot more compact (
https://wiki.openttd.org/images/7/7e/Cloverleaf.png) whereas the ~23x~24 of mine is the tighest that you'd be able to get it, ie: making it any smaller would remove any benefits it would have compared to other junctions in the same class which leans more toward ultimate throughput for the size of the junction.
Edit: I discovered that due to its asymmetric design, it doesn't exactly scale up uniformly soo the maximum speed you'd get from the junction depends on which direction the train comes from and how you design the junction.