Nobody can tell you anything without exact full system info or other technical details like what footage is used, comp settings, effects etc.. What you describe could easily point to a memory leak in a driver or CoDec.
Okay, as I said earlier, there were no effects added. I simply added the video clip to the composition file. It was a simple
clip of my dog running around in circles. It was taken with my Samsung Galaxy 3 phone. I did run the clip thru Sony Movie
Studio but that program couldn't do what I wanted with the clip. It was saved by Sony Movie Studio as a .wmv file. I then took
this clip and imported it into After Effects. When I tried to move the timeline scrubber, it moved very slow. When I tried to do
Ram preview, it was very slow. I thought the clip might have been damaged by Sony Movie Studio so I played it with VLC with
no problem. On Sunday, I did a project without any problem. Don't know how to check for a memory leak. The settings were
HDTV 1080 29.97 width 1920 height 1080 square pixels 29.97 Duration 14 seconds My system info
OS Name Microsoft Windows 7 Professional
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer Dell Inc.
System Model XPS 8300
System Type x64-based PC
Processor Intel(R) Core(TM) i5-2300 CPU @ 2.80GHz, 2801 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date Dell Inc. A03, 2/15/2011
SMBIOS Version 2.6
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
Time Zone Eastern Daylight Time
Installed Physical Memory (RAM) 6.00 GB
Total Physical Memory 5.85 GB
Available Physical Memory 4.28 GB
Total Virtual Memory 11.7 GB
Available Virtual Memory 10.1 GB
Page File Space 5.85 GB
Page File C:\pagefile.sys
Not sure what else you need. I don't know how to check for memory leak. Thanks.