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  • Performance/Sizing
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  • Windows Internals

Faster Trimming & Compacting of Hyper-V Ubuntu VMs

A while ago I described how to compact an Ubuntu VHDX running on Hyper-V using the sfill command. Running sfill, however, can take hours. Luckily, there is a much faster […]

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by Helge Klein on November 10, 2016
  • Virtualization

Keyboard Shortcuts You’ll Never Want to Miss Again

Keyboard shortcuts are the key to productivity and efficiency. This is true for any machine, any OS and any application. This article lists shortcuts I personally find very helpful and […]

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by Helge Klein on November 2, 2016
  • Miscellaneous

Comparison: CPU & GPU Usage of 4 Browsers

How do popular browsers differ in compute footprint when running animations? In this article I am comparing the CPU as well as the GPU utilization of Google Chrome, Microsoft Edge, […]

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by Helge Klein on June 27, 2016
  • Performance/Sizing

What’s Wrong with Group Policy

Over the years I have worked with Group Policy in many different ways. My experience ranges from helping an enterprise client establish a brand new set of policies for physical […]

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by Helge Klein on June 15, 2016
  • Windows General

Lenovo Yoga 900: SSD Upgrade & Clean Windows Installation

The Lenovo Yoga 900 packs some amazing hardware in an ultraportable 1.29 kg 13″ chassis: high-resolution 3200×1800 screen, Intel Core i7-6500U CPU, 16 GB RAM. The only downsides I found […]

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by Helge Klein on June 6, 2016
  • Hardware
  • Windows General

Windows 10 Roaming Profile: Sharing Violation Every 2nd Logon

I came across this problem while preparing my sessions for this year’s conferences. The setup is boringly simple: a user with a roaming profile logging on to a Windows 10 […]

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by Helge Klein on April 14, 2016
  • User Profiles

Hyper-V on Hetzner’s EX51 Hosted Dedicated Servers

Your low-cost high-performance cloud data center building block. This guide explains how to install Windows Server 2012 R2 on Hetzner’s EX51-SSD dedicated servers. That line of servers is very attractive […]

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by Helge Klein on March 1, 2016
  • Virtualization

How Group Policy Impacts Logon Performance #4: Citrix Policies

This article is based on my Citrix Synergy 2015 session and is the fourth in a mini-series on Group Policy performance. All measurements by uberAgent on Windows Server 2012 R2 […]

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by Helge Klein on February 23, 2016
  • Performance/Sizing

VMware Horizon in a Lab: Getting Rid of SSL Errors

This is a description of a quick and dirty way to get SSL to work correctly in a VMware Horizon View installation in a lab environment. Do not do this […]

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by Helge Klein on February 17, 2016
  • Citrix/Terminal Services/Remote Desktop Services

Microsoft Windows Enterprise State Roaming – First Thoughts

Microsoft just announced a new service called Enterprise State Roaming. The broader goal seems to be to replace roaming user profiles. That, however, is not going to happen any time […]

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by Helge Klein on February 6, 2016
  • User Profiles

Why Sizing for Averages is a Bad Idea

When sizing a new environment it is tempting to use averages. It seems the logical thing to do. But is also guarantees a bad user experience. Example: Sizing an RDS […]

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by Helge Klein on February 4, 2016
  • Performance/Sizing
  • Splunk
  • uberAgent

How Group Policy Impacts Logon Performance #3: WMI Filters & ILT

This article is based on my Citrix Synergy 2015 session and is the third in a mini-series on Group Policy performance. All measurements by uberAgent on Windows Server 2012 R2 […]

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by Helge Klein on January 19, 2016
  • Performance/Sizing

Compacting Hyper-V VHDX Files of Ubuntu Linux VMs

Note: if your guest OS supports the trim command you can use the faster method described in this article. If you configured your Hyper-V virtual machines with dynamically expanding virtual […]

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by Helge Klein on January 6, 2016
  • Virtualization

How Group Policy Impacts Logon Performance #2: Internals

This article is based on my Citrix Synergy 2015 session and is the second in a mini-series on Group Policy performance. All measurements by uberAgent on Windows Server 2012 R2 […]

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by Helge Klein on December 8, 2015
  • Performance/Sizing

How Group Policy Impacts Logon Performance #1: CSEs

This article is based on my Citrix Synergy 2015 session and is the first in a mini-series on Group Policy performance. All measurements by uberAgent on Windows Server 2012 R2 […]

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by Helge Klein on November 25, 2015
  • Performance/Sizing

Splunk Accelerated Data Models – Part 3

This article is based on my Splunk .conf 2015 session and is the second in a mini-series on Splunk data model acceleration. Make sure to read parts 1 and 2 […]

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by Helge Klein on November 5, 2015
  • Splunk

Splunk Accelerated Data Models – Part 2

This article is based on my Splunk .conf 2015 session and is the second in a mini-series on Splunk data model acceleration. Make sure to read part 1 first. Under […]

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by Helge Klein on October 29, 2015
  • Splunk

Splunk Accelerated Data Models – Part 1

This article is based on my Splunk .conf 2015 session and is the first in a mini-series on Splunk data model acceleration. Why Accelerate? Have you ever seen this? Splunk […]

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by Helge Klein on October 22, 2015
  • Splunk

Citrix Synergy 2016 Call for Topics: Get Rid of the Video Requirement (Open Letter)

It smacks of lazy reviewers looking for eye-candy. Simon Crosby, former Citrix CTO Citrix Synergy Team, I am writing to you as a guy who has presented many times at […]

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by Helge Klein on October 5, 2015
  • Citrix/Terminal Services/Remote Desktop Services

Citrix XenApp/XenDesktop API Hooking Explained

What is API Hooking? API hooking is all about making others do things they never even knew they could do. More precisely: tricking other processes into doing things differently from […]

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by Helge Klein on October 2, 2015
  • Citrix/Terminal Services/Remote Desktop Services
  • Windows Internals

Performance Footprint of PowerShell Logon Scripts

PowerShell is a popular and extremely versatile tool, but is it a good idea to use PowerShell in logon scripts? Let’s try to find out!

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by Helge Klein on September 7, 2015
  • Performance/Sizing
  • Scripting

FileIOTest – Times the Duration of File IO Operations

FileIOTest is a command line tool that tests the speed of local or remote (SMB) storage by performing some common file IO operations repeatedly and measuring the duration.

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by Helge Klein on August 5, 2015
  • Helge's Tools
  • Performance/Sizing
  • Storage

Converting Mercurial Repositories to Git on Windows

If you work with text, you need version control. That rule applies regardless of whether you write code or poetry (some might argue that those two are the same, anyway). […]

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by Helge Klein on June 3, 2015
  • Software development

Recursively Setting Directory Attributes in PowerShell

As I found out the (excellent) Egnyte Desktop Sync client for Windows ignores directories that have the system attribute set. For some reason some of the directories I wanted to […]

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by Helge Klein on May 21, 2015
  • Scripting

All You (N)ever Wanted to Know about Logon & Group Policy Performance

Citrix Synergy, E2EVC and BriForum are just around the corner. I will be presenting at each of these conferences. Here are a few tidbits to whet your appetite.

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by Helge Klein on May 8, 2015
  • Conferences

Citrix Desktop Viewer Screen Resolution and Window Size

As far as I know there is no “official” way to set the width, height and screen position of Citrix Desktop Viewer in window mode. It can be done easily […]

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by Helge Klein on May 4, 2015
  • Citrix/Terminal Services/Remote Desktop Services

Citrix XenApp 7.6 Logon Slow – Long Black Screen Phase

Update 2015-04-28: Citrix provides the limited release hotfix ICATS760WX64009 that fixes this issue. More information below. During the research for my session about the XenApp 7.6 logon process, to be […]

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by Helge Klein on April 27, 2015
  • Citrix/Terminal Services/Remote Desktop Services

What’s New in uberAgent 3.0

One of the (many) great things about Splunk is that data, once indexed, is not being tampered with. Of course you can choose for how long you want to retain […]

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by Helge Klein on April 13, 2015
  • uberAgent

Splunk Scripted Input Secrets

Splunk’s Universal Forward has the neat capability of executing arbitrary scripts while capturing their output and sending that to Splunk. This feature allows you to turn any executable, batch file […]

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by Helge Klein on March 11, 2015
  • Splunk

Manual Folder Redirection with Symbolic Links

This is a guest post by Bryan Chriscoli, who implemented an innovative alternative to folder redirection with the help of symbolic links, AppSense products and PowerShell scripting. All credit goes […]

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by Helge Klein on February 24, 2015
  • User Profiles
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