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Red Balls of Fire

Bernard Kilonzo

Bernard Kilonzo

Admin

Lead Analytics Consultant

Join date: Dec 13, 2019

Bernard is a senior data analytics consultant based in Kenya with expertise in data analytics and visualization using Tableau, Power BI, and Shiny.

Bernard runs a remote-first data analytics and visualization consultancy firm Rigor Data Solutions. He spends much of his time helping clients design, develop, and deploy solutions that extract valuable insights. He has extensive experience in data analytics consulting, where he has successfully developed solutions for clients such as UNFPA, Social Impact, Day for Girls International, Evidence Action etc. Bernard is a 3X Tableau certified expert and has an undergraduate degree in Mathematics from Egerton University.

Outside work, Bernard loves watching medieval series, enjoys adventure travel, and orchard farming.

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Related Reading (336)

Dec 6, 2025 ∙ 3 min

Sheet Swapping and Legend Popping in Tableau

Overview Sheet Swapping in Tableau lets you dynamically switch between different visualizations on a dashboard using parameters or layout containers, while Legend Popping ensures that only the relevant legends or filters appear when a specific sheet is active. Sheet swapping is a technique to replace one sheet with another in the same dashboard space. Legend popping is a method to show or hide legends depending on which sheet is active. The Problem In this example, I am going to create two...

Nov 29, 2025 ∙ 2 min

How to Create Custom Maps in Power BI with Shapefiles

What are Custom Maps? Custom maps in Power BI are user-defined geographic visualizations that go beyond the default maps. They allow you to import custom boundaries or shapes (like sales territories, clinic catchment areas, or solar installation zones) using formats such as TopoJSON, GeoJSON, or SVG, and then bind your data to those shapes for highly tailored geographic analysis. First Enable the Shape Map Visual In Power BI Desktop, select File > Options and settings > Options . Under ...

Nov 24, 2025 ∙ 3 min

5 Mistakes That Cripple Power BI Dashboard Speed

Dashboard speed in Power BI refers to how quickly a dashboard loads, refreshes, and responds to user interactions. In other words, it’s the measure of performance and responsiveness - how fast visuals render, queries execute, and data updates appear when someone uses the dashboard. What Dashboard Speed Really Means Loading time: How long it takes for a dashboard to open and display all visuals. Query execution: The speed at which Power BI processes DAX queries and retrieves data from the...

Nov 15, 2025 ∙ 4 min

Seven Tableau Mistakes That Kill Dashboard Performance

What is Dashboard Performance? Dashboard performance refers to how quickly and efficiently a dashboard loads, processes data, and responds to user interactions like filtering, drilling down, or switching views. It’s a measure of both technical speed and user experience quality. Key aspects of dashboard performance. Load Time: How long it takes for the dashboard to fully render after opening. Query Execution: Speed at which data queries are processed and returned. Interactivity:...

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