Intelli has became frustratingly slow

I use spring boot web flux with kotlin for development. We have a multi-module project and using IntelliJ since past 6 months ignoring the continuous slowness of the IDE. Now the frequency of the IDE stops working properly as just spiked up at an unbelievable level. Randomly it stops detecting the syntax error, takes ages for a complete maven build, CPU consumption can beat the Chrome CPU usage by a solid margin. Overall the development itself has become a pain. I tried a lot of solutions found on the internet. Cleaning idea cache, increasing RAM allocation, restarting now and then. Nothing seems to a proper solution. I also use PyCharm but have never faced such issue. What else we can do here? Or shall we move from Intellij Idea and look for other options.