No, Apache Solr is not resource intensive. And in most cases, you do not need to invest in newer server.
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Reasons to Choose nopCommerce as an eCommerce Development Solution
February 20, 2019
nopCommerce Days 2018 – Las Vegas
February 13, 2019
Have a look at nopAccelerate Demo Store with 80,000+ products with nopAccelerate Solr and CDN Plugin.