Got a weak laptop? OptiFine is the single best upgrade you can install — it's designed exactly for that.
On integrated graphics OptiFine often doubles the FPS with default settings.
Get the installer or the .jar — both are free and take one minute to set up.
Related: Home (/), 1.20.1 (/1.20.1/), 1.19.2 (/1.19.2/), 1.18.2 (/1.18.2/), 1.16.5 (/1.16.5/)