The verse is capped below the Speed of Light normally with some having FTL perception. Some attacks utilize light so that's Speed of Light attack speed for those techniques.
The movement speed of Information Particles is constant meaning it always stays the same not increasing or decreasing and they are clearly said to not surpass the speed of light.
As it seems, information transfer happens when the particles collide and it takes place in zero seconds which is well and good however there is a delay in the movement of the information particles themselves.
With their speed being constant, this reveals two things namely:
- Information transfer between information particles is completed in zero seconds.
- The process of moving an Information Particle out at least isn't completed in zero seconds.
The rest is easy to piece together. These particles transcend / are unbound from / aren't hindered by time and space so it can be sent to any point in time. This however isn't achieved as a result of speed, it's the result of an ability. Immeasurable speed requires the speed formula to still be applicable but it isn't in this case as distance and time aren't a factor to information particles. They can move to any time period or any spatial coordinate by bypassing both space and time
This is no different from verses where time travel is achieved through FTL movement, how speedsters can achieve time travel through the speed force by going at or above certain speeds but it still isn't immeasurable. Same for spatial manipulators that link one space to another and bypass the distance between them. It's must not necessarily be teleportation or time travel but it isn't immeasurable speed either especially in this case where their speed is stated to not surpass the speed of light