yes i am new to after effects ,
| Operating System: | Windows 10 Home, 64-bit |
| DirectX version: | 12.0 |
| GPU processor: | | GeForce 940MX |
| Driver version: | | 378.78 |
| Direct3D API version: | 12 |
| Direct3D feature level: | 11_0 |
| CUDA Cores: | | 384 |
| Core clock: | | 1122 MHz |
| Memory data rate: | 1800 MHz |
| Memory interface: | 64-bit |
| Memory bandwidth: | 14.40 GB/s |
| Total available graphics memory: | 10182 MB |
| Dedicated video memory: | 4096 MB DDR3 |
| System video memory: | 0 MB |
| Shared system memory: | 6086 MB |
| Video BIOS version: | 82.08.59.00.75 |
| IRQ: | | | Not used |
| Bus: | | | PCI Express x4 Gen3 |
| Device ID: | | 10DE 134D 8216103C |
| Part Number: | | 2701 0006 |
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and i am using red giant effect but by the way it does this without using effect also , when i try onlyu to put a picture and song when i play the song it does this lag dropage in fps
After Effects will usually not play things through smoothly until it's been cached. After Effects is not like a video editing program. Premiere Pro, for example, will just play through video and audio files quite smoothly without needing to cache anything (assuming no effects have been applied), but AE doesn't work that way.
Now, in recent versions of After Effects this has been improved, but generally speaking After Effects needs to cache a preview first before it can play it back. This is one of the biggest "gotchas" that bite newbies in the butt if they haven't gone through a decent Getting Started course.
Speaking of latest versions, have you considered updating? The latest version is 14.2.0.x
Anyway, here's an example. Here is my timeline as I'm working in a project. Note that there is green over the frame I am on (AE has rendered that frame to show it to me in the composition window), but there is no green anywhere else. If I hit play, it will be jerky and slow as AE renders the frames:

Now that I've cached the preview, there is green over my whole timeline and I can play it back real time:

There are settings in your preview panel you can mess with to change how AE does previews (and you can specify different behaviors for starting and stopping with different keys too).
You really, really need to go through some getting started resources to understand how all of this works. AE is way too complicated to try to use it without a solid foundation first!