Process Lasso for Windows Server

Process Lasso Server EditionReal-Time CPU Optimization and Automation

Control how applications run on your servers. Rules and algorithms such as the CPU Limiter keep users and applications from monopolizing server resources, enforced by a background service.

Download Free TrialWindows Server 2012 to 2025 Buy Server Edition

Version 18.4.0 - October 1, 2026 · Release notesDeployment Guide

  • 30-day trial with all features
  • Runs as a system service
Process Lasso main window: live graph, process list with rules, and the actions log
The main window: Live graph, process list with rules, and the actions log. More screenshots

Built for servers

Automation and Control for System Administrators

Rules for Every Application

Create rules that control how applications run on the server, enforcing settings and limits of various types, including CPU affinities and priorities.

A Service, Not a Desktop App

The Process Governor applies process rules and algorithms as a non-interactive system service, even when the GUI is not running. The GUI is entirely optional.

Easy to Deploy

Install silently with /S, push or pull the INI configuration by script, and Process Lasso reloads and applies it when the file changes. See the Deployment Guide.

High CPU use

Limiting CPU Use on Windows Servers

Several features of Process Lasso limit or mitigate the effects of high CPU use on Windows Servers.

  1. CPU Limiter

    Limits a process’s CPU consumption by dynamically constraining its CPU affinity (the set of CPU cores it can use). For hard limits on CPU use, this is recommended.

  2. ProBalance

    Improves responsiveness during high CPU loads by temporarily lowering the priority of background processes that monopolize the CPU. It is active without any configuration.

  3. CPU Affinity and Priority Rules

    Persistent rules give you a greater degree of control over how compute resources are allocated.

Key features

Tuning and Automation for Every Process

ProBalance

Helps maintain system responsiveness during high CPU loads.

Performance Mode

Switch to the Bitsum Highest Performance power plan while demanding apps run.

Responsiveness Metric

See how responsive Windows is, measured continuously and shown in the graph.

Automation

Automate CPU affinities, priorities and other process settings.

Power Plans

Switch power plans automatically when specific apps are running.

Watchdog Rules

Take action on a process when a threshold is reached.

Algorithms

The CPU Limiter, Instance Balancer, Group Extender and more.

Audit System Activity

Log process launches and other selected system activity.

IdleSaver

Use a faster power plan while the server is in use and a power-saving one when it is idle.

Everything it does

Features

ProBalance
Temporarily lowers the priority of background processes that monopolize the CPU, so the system stays responsive.
CPU Affinities
Set permanent CPU affinities so processes run on the desired set of CPUs every time they launch.
CPU Sets
A softer form of CPU affinities that work more like preferred cores.
Priorities
Set permanent priorities so processes run with them every time.
Efficiency Mode
Control and persist Windows’ Efficiency Mode, which marks processes as not performance critical to keep them out of the way.
Disallowed Processes
Immediately terminate any matched process, by your criteria.
Limit Instances
Limit the number of instances a process may have in a user session.
Instance Balancer
Spread CPU cores among running instances of an application.
CPU Limiter
Dynamically and temporarily limit a process’s CPU use when it reaches a threshold.
Group Extender
Let processor group unaware applications make full use of the CPU.
Power Profile Automation
Switch power plans while idle (IdleSaver), when specified processes are running, or on a manual timer (Keep Awake).
Prevent Sleep (Keep Awake)
Keep the system from sleeping for a set time, or while selected processes are running.
Disable Hyper-Threading or SMT
Dynamically disable Hyper-Threading or SMT on a per-process basis.
Advanced Watchdog Rules
Perform an action when matched processes reach a threshold of resource use or other criteria.
Multi-select Operations
Perform an operation like terminate on multiple processes at once.
Configuration Profiles
Create and switch between multiple rule configurations.

Trial and licensing

Try Every Feature for 30 Days

The trial edition includes all features of the software and expires after 30 days, so you can evaluate its full capabilities before you buy.

Workstation or Server?

Server Edition is only required for Windows Server operating systems. The installer detects the system and downloads the correct edition. For Windows 10 or 11, get Process Lasso Pro instead.

Virtual machines are licensed the same as physical machines.

Volume Licensing and Invoicing

Multi-packs give volume discounts, and quantities can be set at checkout. Contact us for:

  • Purchase orders and manual invoicing
  • Payment by bank transfer (ACH, SWIFT or wire)
  • Custom price quotes for specific quantities

Download the Trial. Buy When You’re Ready.

Single server lifetime license: $39.95 $23.97, a one-time payment with all future versions.

Download Free Trial Buy Server Edition
Deployment Guide Awards Questions? Contact Us

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Bitsum Technologies

Independent Windows software since 2002. We build novel solutions to software performance and automation challenges.