Rendering lag and file access delays in SumatraPDF when running background automation environments

[kenji98y]

Hi everyone,

I’ve been using SumatraPDF for years because of how snappy it usually is, but I’ve recently hit a persistent technical snag where the page rendering becomes incredibly sluggish and I’m starting to see "File in use" errors when trying to open new PDFs from my work directory.

I am currently using a deltaexeutor.com community setup to handle some automated local logging and script-based data scrubbing in the background while I review my documents. I’ve noticed that whenever the background executor starts a heavy processing cycle, SumatraPDF’s scrolling starts to "jank" and the search function (Ctrl+F) takes much longer than usual to index. It feels like the background process is competing for the same system resources—specifically CPU threads and disk I/O—that SumatraPDF needs for its high-speed rendering engine.

I have a few related concerns for the power users here:

I’m not sure if the way a style environment manages its internal threading or file-watching is causing a direct resource contention issue with the specific local drivers used for secure socket communication or the way SumatraPDF locks files for reading. Has anyone else encountered performance bottlenecks or "Access Denied" errors while running high-level script executors alongside their PDF reader? I am also wondering if there is a recommended way to isolate the executor’s CPU priority so it doesn't "starve" the resources needed for stable document viewing and interface responsiveness.

I really need to keep this automation active to stay on top of my administrative logs, but the constant rendering lag is making it difficult to get through my reading list. If anyone has experience optimizing a professional workstation for concurrent usage of heavy script executors and lightweight tools like SumatraPDF, I’d love to hear your advice!

Thanks for the help!

[GitHubRulesOK]

Hmmm 3rd party interference is not unusual, but SumatraPDF should not be using much so have you tried adjusting them in Task Manager for example IN DETAILS you could give SumatraPDF Higher priority and TRY set the other lower