The usage of multirange is faster. Fill 2200 rows in columns A,B and you can test the speed with this array:
p=array("A2:B3", "A7:B8", "A12:B13", "A17:B18", "A22:B23", "A27:B28", "A32:B33", "A37:B38", "A42:B43", "A47:B48", "A52:B53", "A57:B58", "A62:B63", "A67:B68", "A72:B73", "A77:B78", "A82:B83", "A87:B88", "A92:B93", "A97:B98", "A102:B103", "A107:B108", "A112:B113", "A117:B118", "A122:B123", "A127:B128", "A132:B133", "A137:B138", "A142:B143", "A147:B148", "A152:B153", "A157:B158", "A162:B163", "A167:B168", "A172:B173", "A177:B178", "A182:B183", "A187:B188", "A192:B193", "A197:B198", "A202:B203", "A207:B208", "A212:B213", "A217:B218", "A222:B223", "A227:B228", "A232:B233", "A237:B238", "A242:B243", "A247:B248", "A252:B253", "A257:B258", "A262:B263", "A267:B268", "A272:B273", "A277:B278", "A282:B283", "A287:B288", "A292:B293", "A297:B298", "A302:B303", "A307:B308", "A312:B313", "A317:B318", "A322:B323", "A327:B328", "A332:B333", "A337:B338", "A342:B343", "A347:B348", "A352:B353", "A357:B358", "A362:B363", "A367:B368", "A372:B373", "A377:B378", "A382:B383", "A387:B388", "A392:B393", "A397:B398", "A402:B403", "A407:B408", "A412:B413", "A417:B418", "A422:B423", "A427:B428", "A432:B433", "A437:B438", "A442:B443", "A447:B448", "A452:B453", "A457:B458", "A462:B463", "A467:B468", "A472:B473", "A477:B478", "A482:B483", "A487:B488", "A492:B493", "A497:B498", "A502:B503", "A507:B508", "A512:B513", "A517:B518", "A522:B523", "A527:B528", "A532:B533", "A537:B538", "A542:B543", "A547:B548", "A552:B553", "A557:B558", "A562:B563", "A567:B568", "A572:B573", "A577:B578", "A582:B583", "A587:B588", "A592:B593", "A597:B598", "A602:B603", "A607:B608", "A612:B613", "A617:B618", "A622:B623", "A627:B628", "A632:B633", "A637:B638", "A642:B643", "A647:B648", "A652:B653", "A657:B658", "A662:B663", "A667:B668", "A672:B673", "A677:B678", "A682:B683", "A687:B688", "A692:B693", "A697:B698", "A702:B703", "A707:B708", "A712:B713", "A717:B718", "A722:B723", "A727:B728", "A732:B733", "A737:B738", "A742:B743", "A747:B748", "A752:B753", "A757:B758", "A762:B763", "A767:B768", "A772:B773", "A777:B778", "A782:B783", "A787:B788", "A792:B793", "A797:B798", "A802:B803", "A807:B808", "A812:B813", "A817:B818", "A822:B823", "A827:B828", "A832:B833", "A837:B838", "A842:B843", "A847:B848", "A852:B853", "A857:B858", "A862:B863", "A867:B868", "A872:B873", "A877:B878", "A882:B883", "A887:B888", "A892:B893", "A897:B898", "A902:B903", "A907:B908", "A912:B913", "A917:B918", "A922:B923", "A927:B928", "A932:B933", "A937:B938", "A942:B943", "A947:B948", "A952:B953", "A957:B958", "A962:B963", "A967:B968", "A972:B973", "A977:B978", "A982:B983", "A987:B988", "A992:B993", "A997:B998", "A1002:B1003", "A1007:B1008", "A1012:B1013", "A1017:B1018", "A1022:B1023", "A1027:B1028", "A1032:B1033", "A1037:B1038", "A1042:B1043", "A1047:B1048", "A1052:B1053", "A1057:B1058", "A1062:B1063", "A1067:B1068", "A1072:B1073", "A1077:B1078", "A1082:B1083", "A1087:B1088", "A1092:B1093", "A1097:B1098", "A1102:B1103", "A1107:B1108", "A1112:B1113", "A1117:B1118", "A1122:B1123", "A1127:B1128", "A1132:B1133", "A1137:B1138", "A1142:B1143", "A1147:B1148", "A1152:B1153", "A1157:B1158", "A1162:B1163", "A1167:B1168", "A1172:B1173", "A1177:B1178", "A1182:B1183", "A1187:B1188", "A1192:B1193", "A1197:B1198", "A1202:B1203", "A1207:B1208", "A1212:B1213", "A1217:B1218", "A1222:B1223", "A1227:B1228", "A1232:B1233", "A1237:B1238", "A1242:B1243", "A1247:B1248", "A1252:B1253", "A1257:B1258", "A1262:B1263", "A1267:B1268", "A1272:B1273", "A1277:B1278", "A1282:B1283", "A1287:B1288", "A1292:B1293", "A1297:B1298", "A1302:B1303", "A1307:B1308", "A1312:B1313", "A1317:B1318", "A1322:B1323", "A1327:B1328", "A1332:B1333", "A1337:B1338", "A1342:B1343", "A1347:B1348", "A1352:B1353", "A1357:B1358", "A1362:B1363", "A1367:B1368", "A1372:B1373", "A1377:B1378", "A1382:B1383", "A1387:B1388", "A1392:B1393", "A1397:B1398", "A1402:B1403", "A1407:B1408", "A1412:B1413", "A1417:B1418", "A1422:B1423", "A1427:B1428", "A1432:B1433", "A1437:B1438", "A1442:B1443", "A1447:B1448", "A1452:B1453", "A1457:B1458", "A1462:B1463", "A1467:B1468", "A1472:B1473", "A1477:B1478", "A1482:B1483", "A1487:B1488", "A1492:B1493", "A1497:B1498", "A1502:B1503", "A1507:B1508", "A1512:B1513", "A1517:B1518", "A1522:B1523", "A1527:B1528", "A1532:B1533", "A1537:B1538", "A1542:B1543", "A1547:B1548", "A1552:B1553", "A1557:B1558", "A1562:B1563", "A1567:B1568", "A1572:B1573", "A1577:B1578", "A1582:B1583", "A1587:B1588", "A1592:B1593", "A1597:B1598", "A1602:B1603", "A1607:B1608", "A1612:B1613", "A1617:B1618", "A1622:B1623", "A1627:B1628", "A1632:B1633", "A1637:B1638", "A1642:B1643", "A1647:B1648", "A1652:B1653", "A1657:B1658", "A1662:B1663", "A1667:B1668", "A1672:B1673", "A1677:B1678", "A1682:B1683", "A1687:B1688", "A1692:B1693", "A1697:B1698", "A1702:B1703", "A1707:B1708", "A1712:B1713", "A1717:B1718", "A1722:B1723", "A1727:B1728", "A1732:B1733", "A1737:B1738", "A1742:B1743", "A1747:B1748", "A1752:B1753", "A1757:B1758", "A1762:B1763", "A1767:B1768", "A1772:B1773", "A1777:B1778", "A1782:B1783", "A1787:B1788", "A1792:B1793", "A1797:B1798", "A1802:B1803", "A1807:B1808", "A1812:B1813", "A1817:B1818", "A1822:B1823", "A1827:B1828", "A1832:B1833", "A1837:B1838", "A1842:B1843", "A1847:B1848", "A1852:B1853", "A1857:B1858", "A1862:B1863", "A1867:B1868", "A1872:B1873", "A1877:B1878", "A1882:B1883", "A1887:B1888", "A1892:B1893", "A1897:B1898", "A1902:B1903", "A1907:B1908", "A1912:B1913", "A1917:B1918", "A1922:B1923", "A1927:B1928", "A1932:B1933", "A1937:B1938", "A1942:B1943", "A1947:B1948", "A1952:B1953", "A1957:B1958", "A1962:B1963", "A1967:B1968", "A1972:B1973", "A1977:B1978", "A1982:B1983", "A1987:B1988", "A1992:B1993", "A1997:B1998", "A2002:B2003", "A2007:B2008", "A2012:B2013", "A2017:B2018", "A2022:B2023", "A2027:B2028", "A2032:B2033", "A2037:B2038", "A2042:B2043", "A2047:B2048", "A2052:B2053", "A2057:B2058", "A2062:B2063", "A2067:B2068", "A2072:B2073", "A2077:B2078", "A2082:B2083", "A2087:B2088", "A2092:B2093", "A2097:B2098", "A2102:B2103", "A2107:B2108", "A2112:B2113", "A2117:B2118", "A2122:B2123", "A2127:B2128", "A2132:B2133", "A2137:B2138", "A2142:B2143", "A2147:B2148", "A2152:B2153", "A2157:B2158", "A2162:B2163", "A2167:B2168", "A2172:B2173", "A2177:B2178", "A2182:B2183", "A2187:B2188", "A2192:B2193", "A2197:B2198")