The wrong theme slows every page you will ever publish. Seven checks — ten minutes — save the regret.
The 7-point checklist 1. Weight of the demo: run the theme's demo through PageSpeed Insights BEFORE buying. If their own sales page scores 40, your site scores worse 2. Page-builder lock-in: themes requiring Elementor/WPBakery for every page bake in slowness and licence fees. Prefer themes working with the block editor 3. Update history: 'last updated 3 years ago' = abandoned = future security hole 4. Real support: check the theme's support forum activity — answered threads in recent weeks 5. Mobile proof: open the demo on a phone, not just the desktop preview 6. Plugin compatibility: WooCommerce needed? Check it is tested, not 'should work' 7. The uninstall test: can you switch themes later without rebuilding everything? (Themes storing design IN shortcodes hold you hostage)
The honest alternatives - A lean free theme (Astra/GeneratePress class) covers most business sites at zero cost - Kairalmas's PKR 999 store themes: complete PHP storefronts with admin — a different, simpler philosophy: no WordPress bloat, own the files - The AI assistant path: describe the layout you need, get clean custom code you own
The installation rule One theme active, two max installed (one backup default). Delete the rest — themes are storage weight and update noise even when inactive.
The theme decision is a speed decision made before your first visitor. Run the checklist — your PageSpeed scores in six months are being decided now.