This package can render infinite list items without memory issues as it is using binary tree algorithm to remove and display elements while scrolling. check the demo and see how it works!

reac-eternal-list.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import styles from './styles.css'

let containerRef= React.createRef();
let dummyELRef= React.createRef();

export default class ReactEternalList extends Component {
  static propTypes = {
    list: PropTypes.array,
    component: PropTypes.func
  }

  state = {
    list: []
  }

  listItemHeightShouldUpdate = true;
  minimumStackSize = 10;
  scrollTop = 0;
  containerHeight = window.innerHeight;
  
  UNSAFE_componentWillReceiveProps(props) {
    this.updateeternalList(props);
  }

  updateeternalList =(props=this.props)=> {
    let shoudUpdate = this.isComponentUpdated(props);
    shoudUpdate = this.setList(props) || shoudUpdate;
    if(shoudUpdate) {
      this.updateListDimension();
      this.updateListVisibility();
    }
  }

  componentDidMount() {
    this.containerHeight = parseInt(containerRef.current.clientHeight, 10)
    this.updateListItemHeight();
    this.updateeternalList();
  }

  isComponentUpdated =props=> {
    if(!this.componentSign || this.componentSign !== props.component.sign) {
      props.component.sign = Date.now();
      this.componentSign = props.component.sign;
      this.listItemHeightShouldUpdate = true;
      return true;
    }
    return false;
  }

  updateNodeDimension =node=> {
    if(node.parent) {
      node.height = 0;
      let temp;
      for(let idx=0; idx < node.data.length; idx++) {
        temp = this.updateNodeDimension(node.data[idx]);
        node.height += temp.height;
      }
      node.top = node.data[0] ? node.data[0].top : 0;
      node.bottom = node.top + node.height;
    } else {
      node.height = (node.data || []).length * this.listItemHeight;
      node.top = this.totalTop;
      node.bottom = node.top + node.height;
      this.totalTop += node.height;
    }
    return node;
  }

  updateListDimension =()=> {
    this.totalTop = 0;
    this.updateNodeDimension(this.list);
  }

  isNodeVisible =node=> {
    return (node.top <= this.scrollTop + (this.containerHeight * 1.5) ) && (node.bottom - (this.containerHeight * -0.5) >= this.scrollTop) 
  }

  updateNodeVisibility =node=> {
    node.visible = this.isNodeVisible(node);
    if(node.visible && node.parent) {
      for(let idx=0; idx< node.data.length; idx++) { 
        this.updateNodeVisibility(node.data[idx]);
      }
    }
  }

  updateListItemHeight =()=> {
    if(this.listItemHeightShouldUpdate === true) {
      this.listItemHeight = dummyELRef.current.clientHeight;
      this.component = this.props.component;
      this.listItemHeightShouldUpdate = false;
      return true;
    }
    return false;
  }

  updateListVisibility =()=> {
    let time = window.performance.now(); 
    this.updateNodeVisibility(this.list); 
    this.visibilityCheckTime = window.performance.now() - time;
    this.setState({list: this.list || []}, ()=>{
      if(this.props.onUpdate) {
        this.props.onUpdate({
          renderedComponentCount: this.renderedComponentCount,
          renderedContainerCount: this.renderedContainerCount,
          renderedDivCount: this.renderedContainerCount + this.renderedComponentCount,
          visibilityCheckTime: this.visibilityCheckTime
        });
      }
      if(this.updateListItemHeight()) {
        this.updateListDimension();
        this.updateListVisibility();
      }
    });    
  }

  setList =(props=this.props)=> {
    if(!this.list || this.list.sign !== props.list.sign) {
      this.list = props.list || [];
      this.list = this.recursiveSplit(this.list);
      this.list.sign = props.list.sign = Date.now();
      containerRef.current.scrollTop = 0;
      return true;
    }
    return false;
  }

  recursiveSplit =(data)=> {
    if(data.length / 2 > this.minimumStackSize) {
      let mid = Math.floor(data.length/2, 10);
      let node = { 
        parent: true,
        getParent: ()=> data,
        data: [this.recursiveSplit(data.slice(0, mid)), this.recursiveSplit(data.slice(mid, data.length+1))]
      }
      return node;
    }
    return {
      parent: false,
      data
    }
  }

  getList =()=> this.state.list || {};

  renderList =(node=this.getList())=> {
    if(node.parent) {
      this.renderedContainerCount += (node.data||[]).length;
      return (node.data || []).map((item, index)=> {
        return (
          <div className={styles.ilParent} key={index} style={{height: item.height}}>
            { item.visible ? this.renderList(item) : '' }
          </div>
        )
      });
    } else {
      this.renderedComponentCount += (node.data||[]).length;
      return (node.data||[]).map((item, index)=> {
        return this.component(item, index)
      });
    }
  }

  handleScroll =e=> {
    this.scrollTop = e.target.scrollTop;
    clearTimeout(this.updationDebounce);
    if(!this.updationInterval) {
      this.updationInterval = setInterval(()=> {
        this.updateListVisibility();
      }, this.props.updateRate || 100);
    }
    this.updationDebounce = setTimeout(()=>{
      this.updateListVisibility();
      clearInterval(this.updationInterval);
      this.updationInterval = null;
    }, this.props.updateRate || 100);
  }

  renderDummy =()=> {
    return (
      <div className={styles.dummyContainer} ref={dummyELRef}>
        {this.props.component((this.props.list||[])[0] || {})}
      </div>
    )
  }

  render() {
    this.renderedComponentCount = 0;
    this.renderedContainerCount = 0;
    let renderedList = this.renderList();

    return (
      <div className={styles.eternalList} onScroll={this.handleScroll} ref={containerRef}>
        <div className={styles.ilDummy}>
          <this.renderDummy />
        </div>
        <div className={styles.ilContainer}>
          {renderedList} 
        </div>
      </div>
    )
  }
}