Solutions for slow loading in large data

[SevenBlueStars]

Hello,
First of all I apologize for my bad English.

I'm using bootstrap select for my project and when I have large data, the bootstrap select is loading very very slow. So I searched for solutions and I found 2 options:

1- Loading the options after searching

I may load the options only when the search module is used, minimuminputlength for search should be 3.

The example I found:

https://jsfiddle.net/NabiKAZ/2g1qq26v/32/

2- Lazyloading
For example I have 1000 data to load but I want only the first 30 to load at first, and the rest should be loading as I scroll.

The example I found:

https://embed.plnkr.co/db8SXs/preview

These examples are for select2 but I'm using bootstrap and don't want to change it. Is there any way I can speed up my loading in bootstrap like in the examples above? Especially the first option would be more beneficial.

I sincerely ask for your help and thank all of you in advance.