Revamp CX Report Code & Data

I have a series of Customer-Experience (CX) reports that were built by someone else and I’m running into two persistent headaches: the layouts never look quite right and the whole thing slows to a crawl whenever I refresh or filter the data... (Budget: $250 - $750 USD, Jobs: Data Analysis, Data Integration, Data Management, Data Processing, Data Visualization, Database Development, Performance Tuning, Python, R Programming Language, SQL)