# Slow Transient Load (~1.6m cells)
**URL:** https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351
**Category:** ParaView Support
**Created:** [March 18, 2025, 11:54am UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351 "2025-03-18T11:54:20Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@fatihmtlm](https://discourse.paraview.org/u/fatihmtlm)
#### Post date: [March 18, 2025, 11:54am UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/1 "2025-03-18T11:54:20Z")
Hi, I have external flow result files originally in Ensight Gold format, containing around 1.6 million polyhedral cells. I’ve tried multiple formats like `.vtu`, `.pvtu`, and of course Ensight Gold, but the loading time for each time step is still too slow. For example, it takes about 13 seconds to load a single time step for a plane slice with one variable using the `.pvtu` format. I also tried enabling “force static mesh,” but it didn’t make much of a difference.
Cpu: 2x Xeon e5 2630 v4 (20 core in total)
Disk: HDD
Ram: 8 slot 192gb 2133mhz
OS: Windows (also tried on Ubuntu Wsl with pyserver)
Is this normal? I am missing something? I assume `.CGNS` may improve but I can’t afford to have hundereds of gigabytes of `.cgns` files instead of 12gb `.ensight`.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 18, 2025, 12:02pm UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/2 "2025-03-18T12:02:34Z")
Is your data on a ssd ?
---
### Author:  [@fatihmtlm](https://discourse.paraview.org/u/fatihmtlm)
#### Post date: [March 18, 2025, 12:29pm UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/3 "2025-03-18T12:29:57Z")
No, it is on HDD.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 18, 2025, 1:16pm UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/4 "2025-03-18T13:16:54Z")
Then put it on a SSD.
---
### Author:  [@fatihmtlm](https://discourse.paraview.org/u/fatihmtlm)
#### Post date: [March 18, 2025, 3:12pm UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/5 "2025-03-18T15:12:31Z")
So I am not doing anything wrong? After seeing things like “StaticMesh” plugin and such, I was pretty sure I am doing something wrong. Let me try on another pc with SSD tomorrow.
Btw, one variable file of the ensight format is around 15gb with 565 time steps and it takes 8-10 seconds to load one step.
---
### Author:  [@fatihmtlm](https://discourse.paraview.org/u/fatihmtlm)
#### Post date: [March 19, 2025, 7:00am UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/6 "2025-03-19T07:00:16Z")
It is 4s now on a sata ssd machine. I thought I was missing something (like static mesh) but now I get it is just a hardware limitation. Thank you, I am sorry to bother.
Still wonder the effects of the plugin tho. Also, do you have any format suggestions for transient cfd in paraview?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 24, 2025, 8:46am UTC](https://discourse.paraview.org/t/slow-transient-load-1-6m-cells/16351/7 "2025-03-24T08:46:43Z")
> [@fatihmtlm](#):
>
> Still wonder the effects of the plugin tho.
Its a bit specific, you can read all about it here: [https://www.kitware.com/staticmeshplugin/](https://www.kitware.com/staticmeshplugin/)
> Also, do you have any format suggestions for transient cfd in paraview?
EnSight is fine.