i get fps drop when gaming pluggin charger when i remove charger fps drop not happen (lenovo ideapad flex 5) my advanced power settings all are on default 

Welcome to the Community, BLAST69!

Glad to assist!

Sorry about your FPS, but the charger should give you the wanted FPS you set since it is direct power (normal). 

Have you tested your charger?

Have you reinstalled or updated your display driver? 

Have you checked the game settings/FPS too? 

What Windows version are you in?

Diox_Lenovo

i already tested my laptop charger its perfectly fine i tired my friends charger i having same issue, I tired updating my display driver nothing happen i tired lowering my game setting nothing happen, when i enter into the game  when connected to charger fps drops in any game (CS GO valorant,mincraft) and i am using window 10 home single language

@BLAST69

There are many reasons why FPS drops. One reason is having a big workload/multi apps open that is more than the hardware can handle. 

Please do the following : 

Uninstall the GPU driver and reboot
Scan using Windows Defender
Check RAM status.
Get the Windows 22H2 version. 

Diox_Lenovo

@BLAST69  

Hello! How are you? How is your PC? We want to make a follow-up since we have not seen your reply yet and this is still not solved. Also, FPS runs low on Battery Saver or instead of High/Ultra Performance. 

Thanks! 

Diox_Lenovo

problem still exists my laptop runs on best performance when plug in to charger(but getting fps drop in interval of time laptop is also not getting heated ). i know it is not gaming laptop but i am playing games on this for an year or so . i also updated the bios and also change the settings in bios but problem is there.......please help i updated my gpu nothing is happening....

BLAST69,

You're right, non-gaming models may not meet your expectations sometimes. 
For FPS issues, that could be the power plan, Vantage, drivers, recent updates, OS, or GPU already, these are the only things you can troubleshoot. Else, it is the design/limitation of the hardware. 

Have you tried System Restore or Soft Reset?

Diox_Lenovo

yes i did reset my laptop if you have any solution  please provide me if don't this conversion is useless just doing time pass..

BLAST69,

Sorry to hear that. You are down to the last, updating BIOS, else that means service time. 

Here are the links in case you need service : 

Find A Lenovo Service Provider https://support.lenovo.com/us/en/partnerlocator  

Global phone support  https://support.lenovo.com/us/en/supportphonelist    

Note: Make sure to keep the BIOS update uninterrupted to avoid issues.

Diox_Lenovo