Today, I did an analysis how to make my test run faster. The objective was my code reads 1000 rows from CSV file using “Data-driven testing” feature, and my test just print all rows in the log. I implemented several patterns of implementation (test cases, test suites, keyword). The result was intere…

@Russ_Thomas [image] Russ_Thomas: I never use tree mode in the Log Viewer, and only print Warnings, Failed and Error : I know you are a wise man! But I am afraid, most of Katalon users (including me) are not. Recently I upgraded to Katalon Studio v8.2.0. Soon after updating, I checked how…

@Jass I hope that Katalon team to review the way how to present the Log Viewer. I think the initial setting should be: show the Table View, not the Tree View in the Table View, do not select All. Select Warning, Failed and Error in the hope that the users’ tests could run as fast as possible; N…

[image] kazurayam: I believe that the LogViewer was reading a execution0.log I am not sure about this. It may be true in the case of a test suite report, but i don’t find such file being created when i execute only a test case. The detailed info from a test-case execution may be stored in a…

An example of execution0.log file: <?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE log SYSTEM "logger.dtd"> <log> <record> <date>2021-11-21T18:42:48</date> <millis>1637487768056</millis> <sequence>0</sequence> <level>START</level> <class>com.kms.katalon.core.logging.XmlKe…

[image] anon46315158: once flushed to execution0.log and rendered by the log viewer, it is released from the memory? Yes, the heap memory is released, the garbage collection working fine, as far as I observed using VirtualVM tool.

[image] kazurayam: Yes, the heap memory is released, as far as I observed using VirtualVM tool. Aha, so this may explain the log viewer behavior. In tree view mode looks like it is rendering some ‘memory unfriendly’ widgets, compared with the table view which displays only text lines Now, I…

[image] anon46315158: Now, I have to find a tweak to close the log-viewer completely in free version Yesterday, I happened to erase the Log Viewer somehow. With having no Log Viewer in GUI, I started a Test Suite. Then Katalon Studio got frozen. Poor guy! Katalon Studio can not live without i…

Most probably, under the hood, the log viewer it is using something like: https://python-gtk-3-tutorial.readthedocs.io/en/latest/treeview.html#the-view

[image] kazurayam: Yesterday, I happened to erase the Log Viewer somehow. With having no Log Viewer in GUI, I started a Test Suite. Then Katalon Studio got frozen. Poor guy! We can not live without it. HA! I managed to turn it off. Right click on the tab, Detach and close the window. Now I…

Yes, I tried detaching the Log Viewer. I found, I could even close the detached window. I had a Test Suite with Log Viewer in Tree mode, which ran in 5 min 37 seconds. When I detached the Log Viewer and closed it, the same Test Suite ran in 0 min 25 seconds. 10 times and more faster! This differ…

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Miscellaneous

kazurayam November 22, 2021, 12:19pm 26

A derivative from this thread:

Topic		Replies	Views
Log Viewer slows down your tests. How to prevent it? Tips and Tricks new-users , katalon-studio	18	6990	June 17, 2026
Change log viewer Web Testing katalon-studio	3	81	February 12, 2025
[WebUI] Analyze Test Case Execution Logs and Resolve Errors Miscellaneous new-doc-request	3	1713	November 23, 2021
Reducing log level for the LogViewer Web Testing katalon-studio	32	9530	May 7, 2022
Log viewer not dispplay the result in tree view Web Testing katalon-studio	8	200	October 13, 2025

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